Happy G
I have only been collecting since 2008. It was a tough time since most knives were being phased out, as BossDog mentioned, in lieu of folders. I was fighting against the wave of fans from the movie, Kick Ass, while trying to get my hands on anything. When I was looking, the Channel 4x were already $300. Basilisk was just discontinued, and Terry Guinn and Balibalistic had closed their books for new goodies. More and more people are still getting into flipping. I see them around on Instagram, Jerzee Devil and YouTube. The flippers have adopted the Alpha Beast and Replicant, though some still stick to their 42 weeHawks and 51s.
The current knives that are available:
Benchmade 51 and 32 Morpho
Morpho Modded Flytanium (awesome titanium scales for the 51 and 32)
Benchmade Model 62, 63, and 67 (Stainless sandwich Balisongs with D2 blades)
Bear Ops Balisongs
Alpha Beast by Bladerunnersystems
Replicant by Bladerunnersystems
Jerry Hom is making a new Balisong that should be released, also (maker of the legendary Basilisk)
Outside of that, the customs are being made. I'm not into the super elite customs by Korth, Dobruski and others. However, people like Matt Cook, Chuck Gedraitis, Sam Eddleman, Darrel Ralph, and David Santiago are making some great pieces.
All I know is that the demand is still hot and the prices keep rising. The 42 Spring latch is running in the $500s and other rarer ones like the 43 and 47 are through the roof.
Anyways, try a Flytanium. I have two of the 51s and two of the 32s. They're pretty darn amazing.