[snaimpally]

I started compiling a list of tube vendors and then added to it based on this thread. In alphabetical order:

https://www.audiotubes.com/
https://bigriverhardware.com/
https://diyhifisupply.com/
https://dougstubes.com/
https://gstube.com/index.php
http://www.mcshanedesign.net/
https://www.sovtube.com/
https://www.tctubes.com/
https://www.thetubestore.com/
https://store.triodestore.com/tubes.html
https://www.tubedepot.com/
https://www.tubeman.com/
https://www.tubemonger.com/default.asp
https://www.tubesandmore.com/
https://www.vacuumtubes.net/
https://vacuumtubesinc.com/
https://vintagetubeservices.com/
https://www.vivatubes.com/
https://www.watfordvalves.com/

[FullRangeMan]

There is Angela:
https://angelainstruments.com/

[YungestMarco]

Recently ordered from Tube World Express and am happy with the purchase.
Especially like that they have pictures and test results for all the matched pairs they sell so you know exactly what you are getting.