My daughter has enjoyed using these learning mats. Right now her favorite ones are the USA mats. We have a couple that show the different states- one which we use to color in the states as we learn about them.
Here are a few more of the ones we have. Solar System, World Map, Presidents, Telling Time, Counting to 10, ABC's, Addition, and Subtraction.
These mats are fairly inexpensive. I usually pick up one or two every few months when I make a trip to a school supply store. I know that I have seen them at a number of different toy stores and online (I might have to start looking for some new ones online since I have pretty much bought all the ones that my regular stores carry).