Often times a town will have rental company that specializes in servicing the area schools. They might be off the radar compared to a guitar store or piano store but if you ask around your local area you might find it's easy.
There is also the possibility that some person has one in a closet... you may not know it if you don't ask around.
I just saw that you live near Houston... I'm sure you'll find that there are several rental houses with student cellos.
Good luck and I hope you enjoy it.
best regards,
mike