This is the last run of the Catalyst. For whatever reason, this batch seemed to play really nicely with Z-Stacks so they decided to include them since it had been a while since they dropped a yoyo with Z-Stacks. (That’s direct from Seth.)
Price is likely reduced due to the lack of royalty and lack of splash anodization. That’s a guess, I haven’t really asked anyone about it because I kinda don’t care. Ha.
Not sure what other information is out there, but that’s the straight dope. This the very last run and if you like this yoyo (which I rather do, personally), I’d recommend grabbing one now before they’re gone so that you can put one in your case next to your Avant Garde and Grind Master and C13 and Northstar and all those other discontinued YYF throws that many of us secretly still love and play with all the time.