I just added 5"x7" art prints in my Etsy shop. I tried out Overnight Prints to test out their quality and I was quite pleased. (I would definitely order from them again, although they weren't especially speedy) The cards are thick and glossy, like a postcard.
I was really just super excited to see my artwork in a glossy postcard format. So fun!
You can order a set of 5 in my Etsy shop or individual cards. They would be nice to give to a friend as an inspirational "pick me up" or you could frame them.