Back in the BC days (that's Before Computer

) we used that vinyl table cover.
As moon sez they seem to attract razor cuts. You don't plan on it, but the drawing board is a good place for it and it's done.
It comes on a roll and has a good memory. You'll be fighting the curl for a while. Get some good double stick tape to keep it in line and don't be cheap with it

If you want a really low budget, write on only solution, get a sheet of illustration board.
Bainbridge 172 hot press finish.
Cheap replaceable and bright white.
Its a heavy, 1/16th (roughly) thick board that will be smooth and clean looking. They also make a double thick version, but that's not really necessary and a beast to trim to size.
The downside is that you'll be tempted to write on it and soon it'll look like a mens' room wall.....at least mine always did.
I'm sure you can find them all here.
http://pearlpaint.com/
They have been around for half of forever and are an institution on Canal St. in Manhattan.
Good luck