48″ x 36″ Role Playing Reversible Vinyl Gaming Mat: Grand Campaigner with 1″ Squares and Hexes by Wiz Dice

Amazon.com Price: $19.99 (as of 20/10/2019 13:23 PST- Details)

48″ x 36″ square battle mat with up to 1,564 square inches of usable space
Reversible! Map out your game on 1,564 one-inch squares, or 2,461 one-inch hexes
The thick vinyl rolls up for easy storage, but lays flatter than laminated paper grids