We rented them from Banana Beach for $50 US per week each. Actually 8 days. THey are available everywhere for rent but I didn't shop prices. We were probably on island 30 minutes when I decided we needed transpo and we needed it fast.
Seems kind of chinsey when Coconuts has them for free and I saw them for sale brand new at the hardware store for $80 US. Regardless it was worth it to us cuz we used them a lot. Plus they didn't charge us for the beach towel we lost. No really we lost it. It just disappeared.
The have plenty there and the staff will adjust the seats and handlebars, oil the chain, etc., to make to them work right. Plus they have baskets for all your shopping needs.
YOu will definitely be pleased with BB.