I’ve been loving Quadro frames. 4 for $49.96!! They’re black plastic with real glass and last forever. http://quadroframes.biz/profile375/14x22_P375_picture_frame_KP3140220G04X
You get two of them per bundle for $26. They fit perfectly for those 14x22 window cards, and they are also very, very light.
I use "Command Picture & Frame Hanging Strips, Large" to hang them up. I cut them in half (vertically), then paste them on the back of the frame. They are very sturdy and easily peels off without leaving any damage on the wall.
Went to Amazon and they were out of them when I looked. (They are back in stock). I decided to order the one from Wal-Mart (11.99 online and 6.50 shipping) Got it today and it is great. Light weight and same backing as the Amazon one. Gonna order that 2 pack from Amazon next and get the free shipping.