Hey Avery,
You will want a CRC 12th Scale car ideally. Most IROCCers run this brand and there are many spare parts available locally. Let's chat in Richmond (if you make it) and we can figure something out. I would bet that between myself, Craig, and some others, there will be some good used rolling-chassis' available. You have the right motor, and any ROAR blinky ESC will work. The only other thing you'll need is a mini servo. I have a 1s battery you can have for free.
Blake