Where can you find the poem who wants a cheap rhinoceros by Shel Silverstein?

The poem "Who Wants a Cheap Rhinoceros?" is not by Shel Silverstein. There is no known poem with that title by him.

It's possible you're thinking of a different poem or misremembering the title. If you can recall any other details about the poem (like a few lines or the general theme), it might help me find what you're looking for.