The entire pool of 2009-2012 Carrera S/4S/Cabriolet/MT cars available in the US is about 20-30. If you go on Autotrader and put just those filters in you get 10 results (for reference, you get 61 for 2005-2008 and 103 for 1999-2004). You have to dig around on different platforms to piece together 20 cars from 09-12, there's strong overlap, going to cars.com, cargurus, carfax, etc. might add another 2-3 each. Using Autotempest to search CL I believe I found about 5 on CL in the entire country. A couple were replicated dealer listings. With these cars you need to pick the things that really matter and accept that it won't be everything you wanted.
Prices on these cars have gone up since last year. They're selling well into the 50s which is why I'm also looking at 997 Turbos which can be had with reasonable miles in the 50s. The difficulty in finding 2009-2012 S cars is causing me to look at the 2006-2008 cars as well, despite some well known engine issues in those cars. They are so much cheaper than the 09-12 cars that you can get the engine rebuilt for about the same differential.
its all about patience. I was looking for a generic family wagon and it took me about a month or two and I only had about 1-2 specific criteria that did not include trims levels. a specialty car like a porsche with a more specific model info I suspect would be more difficult to find 'the one'. but if you take your time you will find what you're looking for, but your budget is what needs to be flexible for this type of car, not the criteria since this is a "want" car not a "need" car. toys you can certainly afford to be much more picky about. example: friend of mine I work with spent 2-3yrs trying to find his current 'toy' (67 chevelle). its not perfect, but it checked the boxes and he had to stretch his budget a little to get the one he wanted.