I don't think anybody will find any battery that fits in a MB for less than 85.00. That was trade cost for a NAPA-Exide (The same Exide who make MB Batteries), a few years ago, when I still worked with a garage- car lot. I have put a battery in a 124, 107, and I think I had to do a 140, but I don't remember much of a reprogram process. Now with a Cadillac, you have to run the engine for 15 minutes, switch on AC for 5 minutes, etc. Its time consuming.
Happy New Year, Dave.

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Currently Driving:
1986 Mercedes Benz 560SEL
1994 Lincoln Town Car
1994 Cadillac Deville
1985 Lincoln Town Car- Retired

The Official Car of a Realtor- Lincoln Town Car
The Official Car of the Successful Independent Insurance Agent- Mercedes Benz S Class