Probably should have mentioned this earlier but..... check out
https://www.cheapcaribbean.com/
http://www.applevacations.com/
and then the normal travel sites
Also i've only rented a car once in Cancun and maybe Greg can chime in if his experience was the same. Rental car rates are stupid cheap, but we were forced to purchase insurance that was about 3x the rental car price per day. So be aware of that, we didn't know until we were already at rental car place. I wish I had done a bit more exploring that trip with the car like Greg did. I purchased an Garmin car GPS unit and bought the map pack for the region to get around.
https://www.cheapcaribbean.com/
http://www.applevacations.com/
and then the normal travel sites
Also i've only rented a car once in Cancun and maybe Greg can chime in if his experience was the same. Rental car rates are stupid cheap, but we were forced to purchase insurance that was about 3x the rental car price per day. So be aware of that, we didn't know until we were already at rental car place. I wish I had done a bit more exploring that trip with the car like Greg did. I purchased an Garmin car GPS unit and bought the map pack for the region to get around.