My friend ended up paying about $12k for his 97 S320 with a tick over 70k on it. It has a few cosmetic issues, but once they are resolved he will have about $15k into it. $15k seems to be about right for one of these.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200