heater box for 2000 s-10

I removed my heater box when my truck was bagged for itre clearance issues,but Im trying to sell my truck,and most the ppl who have looked at it said if i get the a/c working they might buy it. Whats the best(cheapest) way to go about this??I dont have my heater box laying around anymore,it was either lost or thrown away,but i did find the blower motor though.I ran into a guy who said he could build me a sheetmetal box but lost contact with him.Any suggestions would be greatly appreciated guys.

anyone??

not the cheapest but proly the best.... http://www.hotrodair.com/products.cfm

Talk to Dave(Avtek) at suicidedoors, he has built a few.