Replacing a single sleep-comfort component is a much narrower decision than shopping for a complete bed. The key is to separate an exterior cover from a mattress-bottom cover and an air chamber before comparing listed prices. In this group, the choices span $38 to $150, so the component designation matters more than simply choosing the lowest or highest figure.
Quick take
The Sleep Number Select Comfort Eastern King Base Foundation FABRIC COVER ONLY is the lowest-priced route for an E-King foundation-cover need. The Sleep Number Select Comfort C2 Twin XL Mattress BOTTOM COVER ONLY Bed Zipper is the specifically labeled choice for a C2 Twin XL bottom cover. For air-bed components, the Sleep Number Select Comfort E-King Bladder S-274 E-King 118886 R Zippered is identified by its S-274 and 118886 R model wording, while the Sleep Number Select Comfort Air Chamber King S 274 E-KING Bed RIGHT Side Zipper is the higher-priced Eastern King chamber with a right-side zipper.
All four are used, but their purposes differ substantially. The cover choices are gray; the two air-bed entries are beige. Treat the size and model wording as the practical sorting tools.
Listed price comparison
| Item | Listed price | Price position |
|---|---|---|
| Sleep Number Select Comfort Eastern King Base Foundation FABRIC COVER ONLY | USD 38.00 | |
| Sleep Number Select Comfort C2 Twin XL Mattress BOTTOM COVER ONLY Bed Zipper | USD 94.99 | |
| Sleep Number Select Comfort E-King Bladder S-274 E-King 118886 R Zippered | USD 100.00 | |
| Sleep Number Select Comfort Air Chamber King S 274 E-KING Bed RIGHT Side Zipper | USD 150.00 |
The absolute spread from the lowest to highest listed price is $112. The two air-bed entries sit close together in price, while the foundation fabric cover is positioned well below the other three.
Decision matrix
- Need identified as an E-King Modular Foundation Cover: focus on the Sleep Number Select Comfort Eastern King Base Foundation FABRIC COVER ONLY.
- Need identified as a C2 Twin XL mattress bottom cover: focus on the Sleep Number Select Comfort C2 Twin XL Mattress BOTTOM COVER ONLY Bed Zipper.
- Need the S-274 E-King 118886 R designation: the Sleep Number Select Comfort E-King Bladder S-274 E-King 118886 R Zippered carries that exact wording.
- Need an Eastern King S-274 chamber with a right-side zipper: the Sleep Number Select Comfort Air Chamber King S 274 E-KING Bed RIGHT Side Zipper is the relevant choice.
Product notes
Sleep Number Select Comfort Eastern King Base Foundation FABRIC COVER ONLY
Choose this entry when the needed piece is specifically an E-King Modular Base Foundation Cover. Its stated 76-by-80-inch measurement, gray fabric material, and foundation-cover designation make its role distinct from the mattress-bottom and air-bed parts in this comparison. It also has the lowest listed price of the four. The important boundary is explicit in the title: this is a fabric cover only, not an air chamber or a complete mattress component. It is used and described as free of rips, though there are a couple of marks on the underside. That condition detail makes it most appropriate when a used gray fabric foundation cover is the intended item.
Sleep Number Select Comfort C2 Twin XL Mattress BOTTOM COVER ONLY Bed Zipper
The C2 Twin XL wording gives this gray used piece a clear purpose for shoppers seeking that mattress-bottom format. The description identifies it as being in good condition with no stains, and the title includes bed-zipper wording. At USD 94.99, it sits just under the two air-bed entries while remaining far above the foundation fabric cover. Its limitation is also plainly named: Bottom Cover Only. That makes it a focused component choice rather than a substitute for an inflatable chamber or an E-King foundation cover. Prioritize it when C2 and Twin XL are the identifiers that define the part you need.
Sleep Number Select Comfort E-King Bladder S-274 E-King 118886 R Zippered
This is the model-specific air-bed choice for someone working from the S-274 E-King 118886 R identifier. The beige canvas piece is described as zippered, and its stated size is 1/2 King (TXL), helping distinguish it from the separately labeled Eastern King chamber. Its USD 100.00 listed price is only slightly above the Twin XL bottom cover, so the decision here rests on the component and model wording rather than price alone. The tradeoff is condition: it is used and has some stains. Choose this bladder when the S-274 E-King 118886 R designation is central to your search, not merely because it is an air-bed part.
Sleep Number Select Comfort Air Chamber King S 274 E-KING Bed RIGHT Side Zipper
Pick this entry for the listed Eastern King S-274 air chamber with a right-side zipper. It is identified as an inflatable, beige used air bed, and its inflated dimensions are stated as 72 by 34 by 6 inches. Among these four selections, it carries the highest listed price at USD 150.00. The concrete limitation is cosmetic condition: minor discolorations may be present. This chamber is the clearest fit when the right-side zipper and Eastern King wording are the deciding identifiers. It is less suited to a cover-specific search because its stated role is an air chamber rather than a fabric or bottom-cover component.
Final recommendation by use case
For an E-King Modular Foundation Cover task, choose the Sleep Number Select Comfort Eastern King Base Foundation FABRIC COVER ONLY. For a C2 Twin XL bottom-cover task, choose the Sleep Number Select Comfort C2 Twin XL Mattress BOTTOM COVER ONLY Bed Zipper. If the key identifier is S-274 E-King 118886 R, the zippered bladder is the focused selection. If the need is specifically an Eastern King S-274 chamber with a right-side zipper, choose the Sleep Number Select Comfort Air Chamber King S 274 E-KING Bed RIGHT Side Zipper.
