Do you mean an ATC that accepts a 2.2Kw Spindle?
Or an actual ATC spindle?
Blurry customs used to make an ATC that accepted a chinese spindle, but now only seem to have their own ATC spindles for about $3600.
Affordable CNC Router and ATC Spindles
I've heard from someone that has one that it didn't work as smoothly as an HSD, but it's a lot cheaper. I haven't seen one myself.