Well, i can tell you from experience that my team from my regiment has a posting under military current issues (something like that) under military support for breast cancer. We've actually gotten about $450 from people on this site & we have to each raise $2000 for us to participate in the event. You can try here. Another good tool is email everyone you know & have them pass that message on to people in their address book. Having raffles, car washes, garage sales (perfect time of year for that now!!). Keep harassing people, in a NICE way of course, until you reach the limit. Lots of ideas out there! ;D
Good luck!