Bought these from TC Tubes last month and they are unused.
https://www.tctubes.com/Mazda-6V6GT-gray-glass-matched-quad.aspxPurchased for a Mini Torii but I had a change of plans and won't be getting that amp, so the tubes are no longer needed.
In original packaging, closely matched
Quad for $200 (preferred)
Pairs for $100
Shipping to lower 48 included if you buy all 4. Otherwise buyer pays actual shipping.