I see a lot of TeeSpring Campaigns on the NFL groups I am a member of. Not all of them actually sell anything. One of the reasons that many of them don’t sell any shirts is that TeeSpring has minimum orders and the pricing is really high on smaller orders.
This is a good solution: http://linkdynamite.com/tshirtstore
No minimums. Low wholesale pricing. NFL licensed images that you can use! You can thank me later!