I think the reluctance to post a range is legitimate; nobody knows anymore. I can tell you, I think the floor is about $4K now, at least for what someone will ask, publicly. In fact, there is a Club Member here who has a Skylark for sale currently at/about that. As far as I know, it's the most affordable Alembic guitar on the planet.
I agree with JazzyVee, that looks like a California Special... with a couple custom options. Those don't come up frequently, (I do recall a couple...) this one looks pretty good, no obvious issues, and if it's what trips your trigger, you might negotiate starting from $4K in a private sale scenario. If it's a retail sale, then all bets are off. I've watched guitars sit for years, made offers on them, even watched the price go up on a couple, still they sit on the online marketplace. Offhand, I'd guess that guitar sells for about $5-6K to someone who really wants
exactly that.
That guitar doesn't check the right boxes for me, but to put it in perspective, the dream custom guitar I hope to have built would currently cost about $12K. I paid about half that price for a super-nice, basically unplayed Little Darling guitar to tide me over. I wanted to experience specifically those electronics in practice for the education. When the time comes, I may sell that guitar and apply the funds plus what I learned to the ultimate goal. Or I may keep both! I get attached to these things.
Alembics are beyond being the next level, there isn't much room left for improvement after that, and it really comes down to deciding whether putting the disposable cash into one gives you the return on the investment. Make sure you get what you want.
Good Luck, and Welcome. Make sure you post us some pictures of your new-to-you guitar when that eventuality comes along.
*BTW, here is the California Special page.
https://club.alembic.com/index.php?topic=229.0 This guitar has some interesting tweaks. Extra switch is probably [on/off] for LED's, the extra knob... possibly a blend...? Or is it a switch with a round hat knob? I don't see any purpleheart laminates, looks like three maple layers to that neck. Might be worth a serial number lookup.