That is awfully expensive for a potty....i got a wizdog (
www.wizdog.com) for a bit cheaper. my dogs like it, it makes cleanup WAY easier, and the pads i buy last for a long time because they aren't getting their paws all wet on it (those pads have the capacity to soak up more than you think). I end up cleaning the grate briefly daily for their poop, but the pad I change weekly. It's fantastic.
Hope this helps a little.