Question for BAT 6H30 tube owners

I'm a long way from needing to replace the tubes in my BAT pre, but wanted to ask about the cost differential in buying them. I've seen them for $50 per tube and then the MUCH higher cost that BAT or one their retailers charges. I've read that Victor has a large stock of the 6H30's..are they different or a better tube than buying for the lower price? Thanks for your thoughts and/or experience.