if anyone has a Dollar Tree Store near them, check for foamcore there. Mine carries it regularly in the school supplies section. a huge sheet for only a buck...very cost effective if you ask me
I just bought a sheet of it to use for my daughter's cake this coming week. they only have one thickness, the half inch size, but i figure i can always double it up and glue it together for the base. on the covering note: i use tissue paper, since it's easier to fold than regular paper, you can get it in several colors (also at $ tree lol) and then i cover it with cling wrap. works really well and you dont have a bulky edge.