The value of a used 1994 Mercedes-Benz SL-Class ranges from $1,950 to $7,406, based on vehicle condition, mileage, and options. Get a free appraisal here. To understand if the 1994 Mercedes-Benz SL 500 Roadster 2D. $81,495. $7,454. SL 600 Roadster 2D. $127,695. $8,177. For reference, the 1998 Mercedes-Benz SL-Class originally had a starting sticker price of $81,495, with the range-topping Estimated monthly payment and estimated total purchase price include the Maryland processing fee of $500 (not required by law). Silver 1998 Mercedes-Benz SL-Class SL 500 RWD 5.0L V8 SMPI 5 Browse Mercedes-Benz SL-Class vehicles for sale on Cars.com, with prices under $25,000. Research, browse, save, and share from 382 SL-Class models nationwide. $13,995 $500 price drop. Get the Mercedes-Benz SL500 - R129. 1994 to 2002. 34 for sale. CMB $19,723. There are 34 1990 Mercedes-Benz SL500 - R129 for sale right now - Follow the Market and get notified with new listings and sale prices. uMazav.