I would find out WHY the a/c doesn't work. Of course the owner will say it just needs a recharge or something like that. In any event, you want to avoid a W124 that needs an evaporator. Unless you do it yourself, this job can cost $2500 to have done.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280