I would stay away from that store from now on.

To treat the mites, buy Provent a Mite (http://www.pro-products.com/index.ph...d=53&Itemid=59), and until that comes in I'd switch the substrate to paper towels. Change them daily, and give daily soaks in luke warm water. Use the Provent a Mite as described on the can and you should be mite free in days. Good luck!