Other than an EFB or a non-certified Dynon, there’s no affordable and easy to install ADSB-in solution. If you thought that the ADSB-Out mandate was expensive, that’s got nothing on IN, because unless you have a device with a screen that happens to be compatible with IN, you’re talking about a major hardware installation.
We all just assumed that by fitting OUT, that magically ATC would be able to see us all and to provide separation!