Our parent group doesn't do fundraisers - so to speak. They talked about it, had lots of typical ideas (car washes, raffles, candy sales, etc). Bottom line, it was easier to just ask for money. It was a donate what you can afford 'anonymously' approach, without anyone knowing what was donated or when. Some parents couldn't afford anything, while others, myself included, kicked in $100 to the cause. We ended up with over $1500 in the kitty after the first go-around. Plenty to cover the groups expenses, but the bulk tends to help the parents that are having a hard time affording gym. (due to sudden unemployement, etc).
If you want to do a raffle -- I would HIGHLY recommend buying an American Girl doll, along with a few outfits (like the AG leo, gymnastics book, etc), and package them all into a single gift basket. Ask for a $2 donation at the door. Trust me -- when the girls see this upon entering the meet - a lot of parents, and grand parents will buy the raffle ticket(s).