How to box LP's


I plan to sell some LP's pretty soon. Some one at a time, some in small groups - 3 to 10 - and a few in larger groups. Do any of you know where I can get appropriate boxes to ship these varying numbers of LP's?
Thank you.
Art
artmaltman
Post removed 
You can realistically dumpster dive for corrugated cardboard and just duct tape together your own boxes. If that isn't classy enough for you, the art supply store of any art school has sheets of new corrugated cardboard. As long as you have sufficient density, it should survive the transport.
Looks great, thanks for the tips. Boxes found :)

I wonder if even 2 day Fed Ex would avoid the heat problem during the summer?
Art