I looked through my tube stock, here are three I well let go of.
 1) Late 50's Tungsol, gray plate, horse shoe getter, matched pair 12AT7 ($100)
 2) Mid 60's Amperex Bugle Boy, matched pair ECC81 (12AT7) ($100)
 3) 1961 Siemens, ECC81 (12AT7) matched pair ($100)
 All are NOS and burned in for about 20 hours each. 
