I'm charging $800 per student with a minimum of two students, but that is if you can complete it in 4 days. A private class is $300/day ($1200 to do it in 4 days). If you need more days, it'll cost you more.
I am one of those that require Intro to Tech as a pre-req, and here's why:
TDI's Advance Nitrox/Deco Procedures is the largest step you'll have when you start doing deco dives, period. This course introduces you to decompression diving, gas management including accelerated deco, and more. Additionally, while the maximum depth limit is 150', the only limit on how much deco you can do once you've completed the class is up to you. I do recommend to my students no more than 15 minutes of deco after the course until they build more experience, but as I said, there's no upper limit.
I place a strong emphasis on TEAMWORK, buoyancy, trim, equipment management, self-awareness, situational awareness, and global awareness in the course. If you lack these things you won't make it through my course. I require ITT because I've had too many people show up for class convinced they had good buoyancy, trim and awareness and it turned out they didn't. Here's the problem I've faced, if I have three people in a course, and two are squared away and the third isn't, it's unfair to the squared away students to stop the course and go back to basics to accommodate the weak student. And, I've had a couple of weak students that got kicked out of AN/DP and complained about it.
So screw it, I'm requiring ITT now so you should at least be prepared for the course and we can focus on what AN/DP is about, rather than the basics.
IMHO, if your AN/DP course was done correctly, jumping to Normoxic Trimix will be pretty easy and straight-forward.
I just wrapped up an AN/DP course yesterday, we jumped off a boat in Jupiter Florida into a 3 knot current for a 140' deep drift dive filled with sharks, turtles, and more pompano than I can eat in a life time. Because these guys were squared away, the dive went smoothly and everyone had a great time.