Another option would be to issue a "limited edition" coin like many others have done, with a different finish on it for $2.00 more. I think the coin boom has passed, the 2005 coin sold over 2000, the 2007 sold a little over 500.
A limited edition coin - primarily for fundraising - is an EXCELLENT IDEA!
As I remember, the 2005 coin was selling on eBay for upwards of $30 at one time. Sheesh!