It's really not that ludicrous, I have heard of resorts that do this. If you may have your wedding there some places will comp things for you. (Just like Galit said) Call the ones you are interested in and try to make a deal. As they say, closed mouths don't get fed.
If that fails and you aren't fussy, try a hostel:
Hostels in Puerto Vallarta - Book Online at Hostelworld.com