Reptile Grotto w/Watering Dish Petsmart (store only, not online) - $20.00 RattyRat's Review: This natural looking ratty sized grotto is great. It is made of plastic which makes it a dream to clean. It's natural texture makes it easy to grip and climb. And rats just love crawling through it's nooks and crannies. In the fish section at Petsmart stores they usually carry a variaty of different large plastic roots, logs, and stuff meant for fish tanks that work fantastically for rats. They may be expensive, but they last forever and are well worth the money! Also check the reptile section. They get new stuff all the time!