We found ours at Amazon. Small 6x9. I think we paid around $35-40 for it. Still looks good. Recently upgraded from a popup to a hybrid so we may get a bigger mat later on, but this one is still in great shape.
We purchased two of Reversible for a pool project on our back patio pad. This mats fold up easy, has a carrying bag that comes with that is easy to put it back in, none of that wrestling the thing to cooperate, they cleans easy, is water resistant, and has a "soft" feel. The colors are bright and vibrant too! Great value for the price offered!