I haven't explored previous years, but Gallery 1988 does an annual postcard thing. Indy stuff from Jason Chalker, Micah Brenner and Ryan Brinkerhoff. Where else can you get art for $5? Here's 2017:
Micah Brenner
Jason Chalker
Ryan Brinkerhoff (also here and here)
and Augie Pagan.
Micah Brenner
Jason Chalker
Ryan Brinkerhoff (also here and here)
and Augie Pagan.