In the course of deciding to work for myself  I've had to build a few things to help me get to where I'm going. 
While I wouldn't consider these 'products' by any means, they are things I needed to improve my process.  With that said while they aren't products, I can definitely build you something similar with relative ease.  I wouldn't consider myself in the flatbed dump box truck business but I've built one.  I can build you one too.  I'm not in the welding cart business, but I can build you one of those as well.