It really depends on what you consider a house pet. There is some mold (fungi?) growing on the stump of a tree that I cut down a few years back. It seems like it would make a good pet. How much are you offering?
I also have things like:
Stink Bugs.
Grass clippings.
Used motor oil.
Stink Bugs.
Bark.
Very small rocks.
I'm open to offers.
How much for the mold? It sounds like a good pet. Does it require a lot of care and attention?
That's the best part, you just let it grow!
I can offer competitive prices for these pets.