I've heard that spitting cobras and camels get along really well together. My milk snakes are slimming down in size. Watersnakes are the cheapest of all to feed. Rock pythons, ground boas and mud snakes are almost as cheap to feed as water snakes. A single bull, will last a Bullsnake a long, long, time.
Some snakes are really a pain to feed, such as eyelash vipers.
My ex-wife started out as a Beauty snake but at the end she must have morphed into a House snake as my house vanished when she left. I am sorry to hear about your problem with keeping Rhinos. Perhaps you should switch to Ball Pythons - a quick trip to the toy store . . . . . We've got royalty that fulfill no useful purpose, maybe we could share them with the owners of Royal pythons. Then there's the Pigmy python.