I'm opening a shop and I'm willing to sell anything legal. I don't care what you want to buy, I care about being able to provide you with exemplary customer service and quality products.
With that being said, what do you want to buy??
I would prefer 2nd hand sports equipments. Thered be lots of customers i know that these will sell to.
It shouldnt be hard for you to find these items and it would be cheaper.