I started my search for a P99c AS in 40cal last year around this time as a xmas gift to myself. My number one mistake was listening to the sales reps at the new Gander Mountain in Kingston (Ulster County). After waiting 3 months and getting alot of empty promises from GM... I stopped off at Ruger's Customs Guns (no affiliation to Ruger guns...just thier last name) and spoke with Marie and Chris the owners, she went online to their supplier and found that she could have one in QA for me in two days...so two days later I had my P99c QA 40cal. The AS was not an option in 40cal. at the time; and, I have now found that I really like the QA action and have no regrets.
They may not be the least expensive since they are not a chain store (quite the opposite) as I paid 665.00 plus tax. But Chris is a pretty good smith and don't mind supporting the little guys for specialty items such as handguns. In fact I am not sure why I had not gone to them in the first place as they are where I got my first handgun (a Keltec P3AT) and have since had Chris re-blue a S&W revolver.
They are located on Morton Blvd. in Kingston and their number is 845-336-7106.
Best of luck with your P99.
Mike