Sportmans guide has had this buy one get one free for awhile now. It is a great deal, especially when they have free shipping w/ no min purchase. Or as a member when they send you 10$ off no min order.
http://www.sportsmansguide.com/net/cb/used-us-50-cal-ammo-can.aspx?a=805552&pn=2&rid=10&WT.tsrc=AFF&WT.mc_id=k351838
I've got about 10 of these and they are normally in great shape. Fill with ammo, and some dessicant and no more worries.