I have a reply in this post called 2 of the 3 car kits on another board. It may give you some idea what you might need.
Car Kits.

OK now how to work a complete kit into your budget. First prioritize the items you want to include. Get the most needed items first. Nothing says you have to get the entire thing all at once. You can build it up a piece at a time until it is complete. The first items can be relitively inexpensive one use items. You can always upgrade to higher quality later. Notice I said inexpensive not cheap. Cheap junk that fails is no bargin. It could really cost you in the end.

I know the three places you can go where you might find what you need at a bargin price. The various Dollar stores. Sure much there is junk. But some items with a little imagination might fill in a hole. Pawn Shops. Who knows what might be available? You need to check back often because of turn over. Thrift/Salvation Army/ Goodwill Stores or whatever they are called in your area. Some really amazing things are donated to these stores and sold at truely low prices.