Mine was built at home by someone, using a metal frame and wood for the drawer and panels. All covered in marine grade carpet. It was taken out of a Mazda Tribute and advertised on eBay (here in Australia). I picked it up for about $75 from memory. Obviously with the drawer fitted it's impossible to get access to the spare wheel so I only fit the drawer when I'm touring and/or camping. In those cases, I fit the drawer and fill it with recovery gear, air compressor etc. and carry a full size spare on the roof basket.