Jumbo dry erase books that teach kids how to trace letters and numbers, plus include pages of games are a in constant rotation at our house.  We bought our 2 books at Sam’s Club, but I’m sure Costco and many other stores carry them.  These books have been worth every penny, even if you only take into account how quiet the girls are when they play with them.  Sara won’t try anything unless she thinks she’ll be perfect on her first attempt (hmm…where did she get that gene?  Oops), but dry erase is so impermanent!  She’ll just try and try away.