Definately check out Merch, it's one of the best passive income opportunities out there. You need not order any inventory or spend any money. You don't have to setup a website, you don't have to source shirts or buy inventory. You simply get an idea for a shirt, create the shirt, and upload to Amazon. They handle payments, shipping, customer service, everything and you get $5 to $7 per shirt sale. You can quickly and easily scale up to thousands of shirts. I'm doing it very small time right now but a fellow Youtube I'm friends with is doing 5k plus per month with it.