recommended 6922 tubes for a moderate price?

All three mentioned above are good addresses to be trusted. I would be careful with eBay as a beginner.

I agree with the recommendation to contact Andy Bouwman at Vintage Tube
Services. When you're a tube newbee, researching tubes can be a minefield,
and it helps to have one trusted voice to hear. That's Andy. Tell him your
budget, the component that will utilize the tubes, and what sound you're
after, and he'll do his best to lead you in the right direction.

He'll sell you only the highest quality tubes. You won't need to be concerned
with noisy, weak cast-offs.

Otherwise, it becomes a little like tossing a dart at a wall full of well meaning
opinions/suggestions.

Also, Joe's Tube Lore is an excellent primer on 6922 tubes. Highly recommended reading.

I second the JAN-Phillips 6922 for a moderately priced option.

I also caution you with ebay. You'll find all sorts of unbelievable bargains like Bugle Boys for $30/pair, but you won't get any guarantee they're usable. If it sounds too good to be true, it usually is. I had to learn the hard way. Now I only buy tubes from vendors with a good reputation. I've had good experiences with Doug's Tubes, Brent Jesse, the Tube Store and folks on Audiogon and Audio Asylum. I've heard good things about Andy at Vintage Tube Services.

Good luck.

I recommend giving Kevin Deal at Upscale Audio a call or e-mail. He has NEVER steered me wrong. I have bought MANY tubes from him, off of his suggestions.

The above mentioned names are very useful. I've used Jesse and Deal to good advantage. IMO, excellent NOS tubes as a driver at or around $100 would be Tungstram, Mitsubishi and Tesla, in that order. You'll hear a difference between them. Amperex, however, will probably be what you're looking for, but not at your price.