I live conviently 60ft away from a pawn shop. I picked up a dremel for $15. Drill bits are $0.25 each.
I've never had to buy plexi glass but i allways find it at work and have a big collection of diffrent pieces.
Dont skimp on your paint. Get the $15 can. It'll show its price in the end
You probly wont need any bondo. But if you do, make sure you get the fine stuff. If you get the thick (hole filler) bondo, you'll be sanding it down for days. If you get bondo, pick up a tube of spot putty aswell. Its easier to use spot putty than it is to mix up another batch of bondo.
Some other things you might need/want:
Sand paper. Lots of diffrent grits.
Mild Solvent. For cleaning before bondo or paint.
Hand Files. For cleaning up cuts and holes