Booked them today for July 21 and 28, USD $70 between from CUN to Gran Puerto ferry terminal at Puerto Juarez. Pretty seamless online, so far. I'll let you know how it actually goes. (Was pretty seamless!)
Can+cun+Transfers.com (can't actually put the name or website in without autocensor killing it; just erase the "+" signs)
Website:
http://bit.ly/1mYf26t (
NOTE:I am using bitly because the webslite link is altered by the FT autocensor wthout the *)
a service of Servicios Turisticos Van, S.A. de C.V.
Avenida Tulum # 200 Suite 201. Cancun, Q. Roo. 77500. Mexico
Local phone #: 011 52 (998) 210 3317 - (998) 210 4094 - (998) 210 3774
Email:
sales@cancun*transfers.com
Their service for van service to sites such as Chichén Itzá, Tulúm, etc. is
http://www.van.travel
Both members of Associación Mexicana de Agencias de Viaje A.C., the Mexican association of travel agencies, est. 1945