Transponder & ADS-B Setup

[Sluggo]

Folks, I'm looking to buy a plane that does not have a transponder. Where I will be operating the plane on a regular basis I'll need to install a transponder. And at this point, might as well go with at least an ADS-B In setup as well.

After looking at the myriad of makes and models out there, it seems all assume you already have a transponder, maybe even a GPS, too. This plane has none of this. It would be an installation starting from scratch.

Any suggestions on what would work in this situation? Certainly equipment ok for use in an experimental aircraft will keep cost down.

Thanks in advance!