Are you a student? ESM will let you borrow instruments. You could also contact Don. Just go to ESM some time during lessons and say you need a tuba. He will be very helpfull.
Thanks for your response. I am a student, at the River Campus. I just wasn't sure if Eastman had any bass tubas in the Instrument Office. Do you know if they do? That'd probably be the easiest method for me.