If you don't care about gig-e ports for wired devices and only care about the wireless, the cheapest route you can go is probably getting a linksys wrt160n v 1.0/1.1 router (version counts so don't get 2.0 or 3.0 just yet), flash it with dd-wrt v24 pre sp2 firmware and configure it as a bridge repeater. Then you not only get a wireless bridge, but also gain the ability to repeat your signal for your truly wireless devices. That is the best deal around. You won't find any normal market devices that work as a wireless bridge and a repeater at the exact same time. These will run between $65-$80 in stores right now.
If you do want gig-e ports, then you can grab the linsys wrt310n (version 1.0 - it's the only one so far). Still need to flash with DD-wrt to get the bridge repeater mode availability though. It will set you back $95 on Newegg right now.
If you're not big on flashing 3rd party firmware then go with the D-link dap1522. It works as either a bridge or an access point, but can't do both at the same time, and has a port gig-e switch built in. The linksys wet610n only has one ethernet port built in. Both of these operate in 2.4ghz or 5.ghz bands though whereas both of my router suggestions only operate in 2.4ghz.