I put notices out on Facebook and Twitter and promised homemade food stuffs for anyone who donated over $20. I also, for a limited time, matched any gifts I got, that inspired a lot of people to donate. My co-worker just had a bake sale at work for the ride we are doing. He asked his co-workers to donate baked goods and then he "sold" them. He didn't put a price on anything and let people give what they wanted. He raised over $1000.