Dang, you guys got me to thinkin'... Just ordered a quad each of EL34's (Svetlanas for the Bogner) and 6L6's (Sovtex 6L6WXT+), and a pair of 6V6's (Genalex). Most of all my amps have fairly new power tubes in them, so this may be for not. But, I guess it's better to have them and not need them. Certainly doesn't seem like things are going to improve on the tube front any time soon.
Got them from Viva Tubes, and found a really old coupon they had sent with my last order (over 2 years ago) that still worked. You can use code direct1 for $10 off an order of $99+.