Davis does not have very many mechanics. I would tow it into West Sac. there are many places over there that will be less $$$. AAMCO I would not recommend unless you source your own transmission and have them install it. Most mechanics can do that. AAMCO will charge you a lot.
I used to live in Davis. It has been a while but for Davis I used to go to Center City Automotive. its been 20 years since my friend worked there and they are still there. They were established well before that. You can get a rebuild from the bay area shipped up to your mechanic of choice and swapped out.
I would seriously doubt AAMCO would give a fair deal compared to an independent mechanic. Search for mercedes rebuilt transmissions in SFbay area. I know there are a few outfits that have MB rebuilds. They can get them to your mech. in a day.
There are a couple of suggestions for Sacramento MB related shops in the forum good shop list. That may be your best bet. Davis mechanics are expensive and probably don't have MB knowhow.

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Chris
84 280sl
82 300d euro