I occasionally see logos, decals etc. for guitars and amps on sale on Ebay. Don't know how authentic they look.
Email Peavey, they'll be more than happy to give you one.
Quote by corduroyEW
Cheap amps are "that bad". They suck up your tone like cocaine at Kate Moss' party.

I am Michael!
Peavey might give you a replacement logo though many manufacturers don't do so because of the counterfeiting risk. Worth a try though.