Avis is also there, plus lots of local outlets.
Some quotes I got:
Hertz online Cozumel
Mini Car (VW Bug), Manual Transmission, No Air
UNLIMITED FREE Miles
$23.00 (base rate)
$ 2.30 (10% Tax)
$15.00 (loss / collision damage waiver)
$ 3.00 (Personal accident insurance / personal effects coverage)
$43.40 (Total - plus any gas you use)
AVIS
Subcompact Class - Chevrolet Pop or similar Seats 4
Mileage: Unlimited
$26.96 (base rate)
$ 2.70 (10% Tax)
$18.99 (loss / collision damage waiver)
$ 3.99 (Personal accident insurance / personal effects coverage)
$10.99 Additional Liability Insurance
$63.63 (Total plus any gas you use)
I also got a quote via e-Mail from Lesspay
http://www.islacozumel.net/services/lesspay/ (by John Devries -
lesspay@prodigy.net.mx) for a VW Safari (A VW "The Thing" in the US:
$30 plus $10 insurance plus 10% tax = $44 a day.