Strange Request - Corks

[MontereyRick]

Does anyone know of a place where wine corks (preferably used and of different wineries) can be purchased?

We have some 4"x4" wood posts in our cellar that go from floor to ceiling (approx 7.5' high). We've been trying to figure out what to do with them from an aesthetic standpoint. My wife has come up with the idea of facing them in "wine corks". I think it would look pretty cool but would take a ton of corks. Anybody know where corks can be purchased?