Every time you create a t-shirt or any other item, you'll need to add your   desired commission to the base price. At that point, you have to decide how "expensive" you want the final product to be for your users, and this can sometimes be a difficult decision. The key is  common sense . Setting an excessively high commission will make the final price too high and discourage potential buyers; setting a commission that's too low will reduce your profits and, consequently, your motivation. We recommend between 10% and 20%  of the total base price, although naturally, some items can have a higher markup without significantly increasing their cost. We also recommend testing different prices to see which ones resonate best with your customers. Ultimately, keep one thing in mind: some market research has shown that for certain products, the higher the price, the better the perception potential customers had of them, and consequently, the higher the sales. The same item at a much lower price meant a drop in sales. Food for thought, I tell you ;-)