A matched (quad) set of the new Mullard 88s from a reputable Ebay seller (I bought my 120s and 150s from there) are $179, and the 150s are still $269…same as when I bought mine last year. I have Tung Sol 6550s (came with my amp…Jolida JD502P with factory upgrades), and Sovtek KT88s, and they sound great…but compared to the 120s and especially the 150s there is a general improvement in tonal accuracy and dynamic slam from these newer designs. Many amp designers have embraced the 120s and 150s as the new standard of this type of tube, and I wholeheartedly agree with this. Other opinions may differ of course, but those opinions are utterly wrong…heh…kidding…sort of...