How's this for a 20th anniversary item?
A jar of Sonic Anti-Aging cream! Clearly a limited edition item, this little jar of cream comes in a fancy paper certificate/box. It says "Baume Anti Age 20 Ans Et Pas Une Ride" It has the SonicTeam logo Sonic head, and 1991 - 2011 below it. Someone has written a note on the top flap, which is in French so you can't read it. The bottom word, however, is "forever". In all, it is a wonderful presentation for the cream, and CERTAINLY a very unusual item to collect. If you can manage to get this, it's sure to be a star in any collection.