Seriously, If you have equipment from Manley Labs, you should contact them directly if you havent already because they have a very large supply of NOS tubes from the 50's 60's 70's. These will sound way better than any new reissued Gold Lion's (this is what all the sites sell). Otherwise try ANDY at Vintage Tube Audio in Michigan. (be prepared to wait a while its worth it) :-)
Matt M
Matt M