Sounds funny to use the word cheap in any paragraph related to aviation, but here goes: I am taking the Mooney to the avionics shop for a 345 to go with my 430W. That is not an inexpensive solution, but worth it for the missions that she is assigned. My Cessna has a very nice custom panel with six pack, center stack, etal. On a nice flying day, I sometimes fly to the DFW area and in any airspace I would like to be putting out an ADS-B signal. It seems like I remember some discussion somewhere along the way about cheap OUT solutions for experimentals and such. So...... what are some reasonable solutions that are a practical investment for a $20K plane? I don’t want to put a $100 saddle on a $10 horse.