A couple audio pickups that I got for reasonably cheap—a Mojo Enigma power cable and a scuffed-up Sonore ultraRendu:
Funnily enough, I wasn’t expecting all that much from the ultraRendu, I more picked it up so that both my main setup and my secondary setup could both have a streamer, but the improvement over the microRendu is really not subtle. So yeah, that was an exciting unexpected win.