Your going to have to spend $10k-$15k to get a decent W140.

http://www.autotrader.com/fyc/vdp.jsp?ct=u&car_id=244200370&dealer_id=53793586&car_year=1999&model=S500&num_records=25&systime=&make2=&start_year=1981&keywordsfyc=&keywordsfyc=&keywordsrep=&keywordsrep=&engine=&certified=&body_code=0&fuel=&awsp=false&search_type=both&distance=0&marketZipError=false&search_lang=en&make=MB&keywords_display=&color=&page_location=findacar%3A%3Aispsearchform&min_price=&drive=&default_sort=priceDESC&max_mileage=&style_flag=1&sort_type=priceDESC&address=06460&advanced=&end_year=1999&doors=&transmission=&max_price=&cardist=2608

Damn they are cheap these days!

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