As far as i can see they havent had any for a long time. It may still be on their website but its always out of stock. Im going to check out a selection of marco rock on tuesday. As far as man made goes i think its pretty decent. Pretty much all my equipment is on order now (battling ups's rediculous broker fees for some items). For the tank i was waiting for more epoxy paint but now that i have it ill do 3 more coats this weekend and then ill install the glass next weekend. Of course after all this i cant even get any livestock with the airlines being down, but ill at least be ready. Hopefully they start flying again this year...