You might want to try the Camillus sub-forum. They make the becker products now and you would probably get a better target audience like that...
All that being said, I don't *think* there was ever a BK8. Logic, which often means sh*t, would dictate that they weren't *necessarily* sequential but jumped from BK7 to BK9 to reflect the blade length.
*edit to say that the BK77 reflects a Retail value and most beckers can be found for something like 30-40% less than retail with no real problems. 'course, I still think it's too much for that particular blade, considering, though that the other beckers are a bargain at their discounted price. I'm pretty sure I've seen the BK77 at ~$225.