I just went and bought 8 stacking file boxes from Office Depot for 2.50 each. Deal ends today but next week you can get them for $5 each which is still great.
http://forums.slickdeals.net/showthr...id=0&t=1104996
They won't work for heavy stuff like unit blocks but the Mega Rig Space shuttle fits fine. I think 8 might have been a bit of overkill for me but I can always use them in the garage etc.