I'm still in mourning over the closure of the "The Tube Shop", which is where I got a lot of ANOS (As New Old Stock Used) preamp tubes, as well as some NOS rectifier tubes. Yes it was all order by email and they would get back to you, but I got some great tubes at nice prices. There's still KCA Nos Tubes out there, which has some good deals on the ANOS tubes.
JJ Tubes, unfortunately are now the tube of choice for a lot of amp companies, as they can withstand high cathode follower voltages, and are rugged. My Mesa Mark V was full of them when I got it, and I think my Friedman JEL-50 probably is as well. When I get some time I've gotta get rollin' rollin' rollin'. Keep those tubes a rollin'.