YUP... checked... available in 25 for under $10, try them out ... they also have 100 packs

6x6
http://www.printfile.com/35-6hb_25.aspx

6x7
http://www.printfile.com/35-7bxw_25.aspx

and a whopping... 7x6 that's right, 7 frames per strip! crazyness!

http://www.printfile.com/35-6hbxw_100.aspx