Rebuilt transmissions retail for $1195 plus shipping. Pull it yourself, it looks like a simple job on my SDL. Their is a near mint 1989 560SEL for sale down the street from me. They want $8995 but I bet you could get it for $6500-$7000. But if the one your looking at is nice; say $1000 for the car plus $1195 for the trans plus $250 for new flex discs and trans mount and you could have a real nice car. Throw in a timeing chain if there is no record of that getting done. So $2450 for a 560 with a new trans, say $3000 after doing all of the old car stuff belts, hoses, filters, etc. If you do the work yourself the numbers work.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200