I've never ordered from them, but I remember someone suggesting this website: http://www.wineandcake.com/browse.cfm/cake-decorating/cake-foil-for-cake-boards/2,1238.html
Hope it helps!
I bought some silver wrapping paper (from Wal-Mart) to cover some of my boards. It was really cheap and it looked really nice.
I guess I thought it would be fine since the cakes were not sitting directly on the paper. 
The cake decorating shops here all sell the foil in different colors. One sells by the roll and the other by the foot.
I usually use wrapping paper covered in plastic wrap, with the cake sitting on a different board on top, or I use fondant. I usually save all of my fondant scraps and use them up on a cake board that needs to be a dark color (so I can mix a bunch of colors together then color them the dark color). I almost always make a pattern in the board, either with the wilton purple rolling pin with the spirals, or rubber stamps or cookie cutters.
The cake decorating shops here all sell the foil in different colors. One sells by the roll and the other by the foot.
The difference that I've found is preference in the quality... I LOVE the floral foil because it's thick, double-sided with plastic in between the layers and you cannot accidentally rip or tear it. It's also reversible which comes in handy say if you run out of gold foil, gold is on the reverse side of red. Maybe you think you'll never need green foil, so you don't buy a roll but now you wish you had green... it's on the opposite side of your white foil. Nice variety of patterns too.
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