D-Link 632 $40 at office works. Seems like an alright deal as it has 8mb of flash so it can run full DD-WRT (and the install process for this model isn't too bad from the wiki).
Doesn't get the best reviews as a router otherwise, but still good for the price especially if your going to run DD-WRT.
Personally I am going to use it as a cheap extender.
DD-WRT install should be straightforward apart from this:
"Can only load on the NA (North American) versions of the router. You need to Hex Edit the NA firmware to load elsewhere per the instructions."
http://www.dd-wrt.com/wiki/index.php/D-Link_DIR-632