I've been doing fundraisers for 3 years now, and the most profitable is a liquor draw.
Basically spend $200 on various bottles of booze, and sell tickets for the draw. 3 tickets for $5, and you'll need to sell 40 tickets to break even. That's like 4 per team member to break even. Everyone loves the chance to get a $30 bottle of Rum for $5.
With 15 team members last season we made almost $1500 on the booze drive alone, and that's after taking into account the $300 in booze we offered.
For league fees most guys will just pay up. But a booze drive could cut those costs by a few hundred bucks, and you don't even have to stand outside of the Save On selling apples.