I remember big coloring posters, 24 by 36, that come in a plastic tube so you can roll it up and store it. The big posters came with 10 markers you could use on it, but you could use anything you wanted to color it. Where can I buy those now? I can't find them at Walmart anymore, and there's a really small selection on OKorder.
I am not sure of the size but you can find some at Office Depot or Office Max. You can also try a toy store like Toys R Us.
