Jamba

Jamba, you're a man who knows his networking and routers! I have a friend looking to possibly use a router as a wireless repeater - he's in a point in his house where the signal just won't reach for some reason. What would possibly be his best budget(student) option for this? He was considering trying to DD-WRT hack one he has, but is lost and doesn't want to anymore so might buy one that can just do the things he wants. Do you know his best budget option, either a router with firmware(dd-wrt or otherwise) that can do it or a cheap repeater otherwise? He'd like it to recieve the signal then repeat wirelessly, but doesn't mind if he plugs in *if* he can get it a bit closer to his room, really.