I agree with Lead Sled, I am in Cabo right now for the second time this month and 3rd time this year as well as having been to Puerto Vallarta. I do everything on my own now, I think it is absurd that you pay a handler $300 or more plus administrative fees to fill out some paperwork.
I have the annual permit for operating in Mexico so this trip to Cabo will cost us about $100 in tips plus the normal airport fees and parking for 7 days, around a $1000. My first trip here using a handler cost around $1800.
A good friend of mine just did Cancun on his own, just called the fbo and they took care of him.
Have fun!