I have managed to secure a discount from Springly's developer James Sides. Normally he sells licences for $97 but as a special for Ninja Group members you can grab it for only $47.
Springly is not only useful for t-shirt ads, it can also be used for all Facebook ads…in fact it's the only graphics tool I use now.
I don't know how long James is going to keep the price discounted, so unless you are already great on Photoshop, I would jump on this offer!