Any gas balloon pilots here?

Hi,

I may have the opportunity to take a ride in a helium balloon this
summer and have a few questions for any gas pilots here.

Opprox. what is the cost of a smaller system new, what is the appox.
cost of fill-up, did you get "hooked" on your first flight, does
maintenance require an A&P (I would guess just an A) and another
question or 2 for a pilot and/or experienced gas balloon crew.

Thanks,

Ricky