Sylvania power tubes, Electron Tube - "7236" (This pair was boxed in 1963.) $100 - I eat the shipping/paypal fees.
I bought these NOS by Woo Audio in the early 2010's as the upgrade option for the WA2. I only put around 10-20 hours on them as I found a good deal on a pair of Tung-Sols shortly thereafter. The amp and Tung's were recently sold and the buyer took the offer of a lower the price with the exclusion of this extra pair of tubes.
Since they don't take up much space, I'm not accepting offers at the moment.