Mainly into drag racing, strength training, fabrication, electronics and firearms.
I build my own race cars and have my own small home gym where I train my kids during their wrestling offseason while fighting my own losing battle against fat.
I finance my racing operation through Ebay sales. Check out my seller page. I mainly have car parts, electronics and robotics parts, along with industrial surplus like welders, variable frequency drives, etc..
A very prescient quote from the 1877 book entitled "Labour and Capital".
"Every man, who is not a pauper, is dependent on his own industry and vigilance for the subsistence he needs or desires."