Im not very good at making things but im good at turning a profit, used to buy childrens riding ponys at general horse sales, clean them up a bit and sell them through the papers, also used to deal in show poultry, bought show quality birds at a big sale and sold them at smaller sales.
Same with auctions and car boot sales
Given up on most of that for time being, still have a room to clear of junk that I will most likely send to auction