Now that's exactly what I was waiting for.
From the Garmin blog today, a post that explains their new trade-in program. Basically, starting July 1st, you can purchase a new Garmin (from a "participating retailer") and send in your old one for a $50 rebate. They'll refurbish your old watch and donate it to Girls on the Run SoleMates.
Sounds like a great deal. Not many details are forthcoming yet, but I'll keep an eye on this.