Walmart sells these storage containers:
http://www.walmart.com/ip/ArtBin-Ess...4-x-3/25394016 They don't have a handle but store nicely and hold 12 1/2" unfinished blocks.
Michaels also sells something similar.
http://www.michaels.com/10331371.html
I have some of both and really like their prices...much less than most other places.