New robot geek here, thought I'd drop in and say thanks for the great site. I'll start off a trivial contribution:
Amazon will give you $30 for applying for an Amazon.com credit card (no annual fee, instant approval). I'm trying to bootstrap myself as cheaply as possible, so I did that and picked up a couple robotics books for next to nothing.
FWIW, I ordered "Robot Builder's Bonanza" and "Robot Programming : A Practical Guide to Behavior-Based Robotics". Now for some cheap motors....