Is it River Runners Shuttle Service? rrshuttleservice.com?
Sounds like a great deal even without kayaks.
River Runners has been running a $55/person special from Pierce - Vegas this last year and it seems like a great deal too. If you are willing to sleep on the boats(no brainer for me), you can save $1200+ on Huali fees, and end up at Pierce which is only 1.5 hrs from Vegas. Being able to takeout at 7am also puts you back in Flagstaff at 1 pm. Folks at Diamond Creek have just hit the top of the road, and are 2+ hrs behind.