Being limited to your local Walmart doesn’t give you many options, and certainly not the best bang for your buck. But that’s up to you. I found two options, both about $45 before tax. It may require an online purchase, or perhaps ship to store.
ZyXEL Prestige Wireless Internet Sharing Router, P330W
http://www.walmart.com/ip/ZyXEL-Prestige-Wireless-Inter...
The ZyXEL P330W can be configured as a wireless Ethernet bridge by placing the router into “client” mode. A relatively simple process and doesn’t require the installation of third party firmware.
$45 (+ tax) is a lot of money for a relatively simple and otherwise ordinary router. You could get it for about $33 shipped from either Buy.com (
http://www.buy.com/prod/zyxel-p-330w-802-11g-wireless-h... ) or Amazon.com (
http://www.amazon.com/ZyXEL-P330W-802-11g-Wireless-Rout... ).
Linksys WRT54GS2 Wireless-G Broadband Router with SpeedBooster Technology
http://www.walmart.com/ip/Linksys-WRT54GS2-Wireless-G-B...
The Linksys WRT54GS2 v1 supports dd-wrt third party firmware. Once dd-wrt is installed, it can be configured as a wireless Ethernet bridge using “client bridge” mode. This assumes the WRT54GS2 is indeed v1, not some later release (a quick check of the Linksys website indicates they’ve only ever produced v1, so that’s good news). But of course, having to install third party firmware and configure dd-wrt might be a bit overwhelming for some ppl. But you do get a bigger bang for the buck compared to the ZyXEL P330W. The Linksys is simply a better quality product.
Like the ZyXEL P330W, I’m sure you can find this Linksys WRT54GS2 much cheaper at places like Newegg.com, Buy.com, or Amazon.com.
So if you want the simplest solution, that’s the ZyXEL P330W. If you want the most bang for the buck but with additional complexity, that’s the Linksys WRT54GS2.
And if you decide to purchase online as I suggested, the best options are those I listed originally for the ZyXEL WAP3205 or ASUS WL-520GU in terms of bang for the buck. Or the ZyXEL P330W for the absolute least configuration problems (not exactly plug and play, it takes some effort, but as simple as it’s going to get unless you buy the MS wireless adapter instead).