If you happen to live in Seattle or Boston you can go to a couple of select Starbucks locations to try out any bean they have made specially for you. Sweet.
According to one commenter on Starbucks Gossip,
The one on Queen Anne in Seattle is on the corner of Queen Anne Avenue and W. Boston. The one in City Centre in on the 6th Avenue side of the City Centre building.
From another commenter :
The Stores in Boston with the Clover are 75-101 Federal (Downtown) 1 Charles (Beacon Hill) and Harvard Square (The Garage).