Try SKB cases or State Surplus (Score 1)

I think these are pretty economical. A 12U case is $130 at http://www.americanmusical.com Here's SKB's site. The roto racks only have holes on one side (front). I've also seen 72" racks for as little as $15 at NC State Surplus. Might try there if your local organizations have ways of recycling stuff. Good luck, Eric