Rachel, sponsorship was horribly daunting for me, but so was finding walkers! I guess adding those 2 and 2, my 4 is MARKETING. That's my weakest point in any venture, and it held true for this one.
My sponsors were all personally known to me. The company that donated the money for our insurance cost, for instance, is a large firm, whose CEO is a friend of my Dad's. I didn't manage to get the in-kind donations of food and water that you did.
The other main source of sponsorship was from the cards my Mom mailed out to her holiday card list. We got hundreds of dollars from that campaign. They consisted of a picture of Nicky when he was still in the NICU, and a reminder of what we'd gone through. People I hadn't seen since I was in preschool sent checks for $100 or more. It was incredible.
I'm already getting started for next year. I have found the name of a marketing person at a local radio station whose main market is women between the ages of 18 and 35. I plan on getting together with him for coffee some time this fall, to see if we can work out some sponsorship. I'm also planning on getting an actual 5K walk site this year. Last year's was under a mile, and it didn't really give us a chance to talk much during the walk.
I'm looking forward to next year's walk, although I have a feeling it's going to creep up on us all too soon!