William Kahn , Apr 29, 2010; 09:16 a.m.
Good luck at Staples. All the transparency film I've seen there is 8.5X11 and designed for use in laser/dry ink printers. Also, most of the printers are also 8.5X11 paper size and designed more for general home/office work rather than high-quality photo printing. You might have better luck finding the right printer at a store like Best Buy, but I'm not sure where you'll find the transparency film you need.