Often, people are members of more than one guild. Our groups in the Carolinas are always happy to see others' raffles. Spread the word that way.
Go to area quilt shops, and offer them an additional discount (so they can resale) if they buy a bundle.
Have a booth at any other area craft shows/flea markets/farmers markets.
As far as individual incentives, if the quilt will be raffled at a show, ask the show vendors if they will donate some goodies for 1st, 2nd, 3rd place ticket seller (fat quarters, charm pack, small pattern, etc). Then give credit to them as "sponsors".