The other day I was goofing around online and spotted some cool GW caps from Lids -- I didn't know they carried them. That got me browsing more and I found a few nice designs on other sites like the GW Athletics Department's official store. (The GW Bookstore seems to carry the same ones as the department.)
They're also not too expensive, and some of the ones on Lids are on sale.
There's some cool designs on both sites -- any other places you'd suggest to find GW hats or other gear?