I've been looking and can't find them. But it looks like a transparent sheet with white lettering. One bride on WB explained how she made hers: " I had seen a transparent menu in a picture somewhere and thought it looked cool, so we had these printed at Kinkos (laser-printed on transparency paper)." I will keep looking, tho.
Re: help me find these
http://www.lcipaper.com/translucent-vellum-paper.html