There's a Lids warehouse store here in Indianapolis. It's got a lot of stuff like shirts, polos, shorts, team warumups, coaching gear, etc that was printed for specific schools and teams that was returned for one reason or another.
I've picked up some really cool D3 stuff there the last few times I've been. It's mostly schools within a few states like Carthage, Heidelberg, Hope, Alma, Ill Wesleyan, Wash U, Coe, and Wittenberg. But, I've seen stuff from D3 schools all over. Managed to pick up Southern Maine volleyball and Occidental baseball yesterday. I'm now a D3 shirt hoarder.