So I stumbled back across this and not sure who else is aware.
But dangerousthings.com has a secret little store for all those extra little bits of merchandise you didn’t know you wanted
(Prices shown below in Australian dollars , but can be changed in the store)
I have a few shirts made by redbubble. Never had a bad experience with them, though I’ve never had any experience selling with them (I’ve only done CustomInk)
My wife has some of her photography up on red bubble and every now and again sells some. No problem with them as a vendor (she doesn’t advertise or promote her stuff at all, it’s just there.)
I actually grabbed the shirt I bought on red bubble. It doesn’t show up as well on camera, but the printed ink is definitely fading faster than I was hoping. This shirt is maybe 1 1/2 years old.