If you like the Redskins, or are an ironic person, get yourself to Marshall’s in DCUSA: there’s a whole rack of Robert Griffin III jerseys for $8 (or $10 for XL and above) — presumably ones that didn’t sell after RGIII went to the Browns.
They’re actual, name brand jerseys too, not t-shirts, and when I was there they had white, red and the alternative maroon jerseys.
They also have some other players like Pierre Garcon, but those are more expensive, around $40 — which is still a lot cheaper than regular prices. The rack had “shirseys”, the t-shirts that look like jerseys, and other related Redskins paraphernalia as well.
