I'm looking for a transponder, just something cheap that will get the job done. Any recommendations?

What do they use at your local track??
Transponders are not cheap.. well, in comparison to what you invest in a vehicle, guess they are cheap LOL

MRT's work great, perfectly compatible with current amb/mylaps systems that dominate the scoring world. AND they are $30 cheaper than a Mylaps. Stormer has em for $79.
I'll sell you a new one in the pack without tabs for $70 shipped. only two left.

considering they can be sold for almost what you pay for them. They are a inexpensive investment,