For sale is an ESS 625 Supercharger Kit bought from BPM motorsport (original post
here). Pretty firm on price at $4500, probably the lowest you'll see anywhere
The kit was on my car for ~10k miles and is in overall good condition. I also took reasonable care taking detailed pics of the installation and marked everything to make re-install as easy as possible.
During my tenure the supercharger oil was changed once and I replace the air filter + always had a sock on it. I also had the injectors cleaned/flow tested when I purchased it and swapped to a slightly shorter/tighter belt. The only negatives are that the fill/drain plug on the blower is slightly stripped (it's brass and was largely that way when I got it) and one of the stainless bolts broke off when removing it, which I replaced with a steel bolt. I also have the tuner from BPM but I believe it's VIN locked to my old car (not sure if it can be unlocked - if not a tune from him is ~$1k).
Located in South Los Angeles (90043) but can also meet up in Orange County (I work near Irvine Airport).