This is a hard question to answer because Mercedes Benz makes a variety of different convertibles. There is a Mercedes Benz E550 convertible that is on sale for 2011, but in 2008 the comparable model was called the Mercedes Benz CLK. Also, I don't know if either of these vehicles are quite sporty enough to be considered a roadster.
Assuming you're not talking about an SLR, the other two possible options are the SLK and the SL550 (or one of the AMG versions of these two vehicles). For a 2008 SL550, I've included a chart below estimating depreciation. Since your car is three years old and it's depreciated $10,000-$12,000 per year, I'd say that your car has lost around $35,000 in value.
If you have an SLK, your depreciation should be around $14,000 total. However, variables like mileage are still going to have a large effect on the final value of your vehicle.
The Iconic Mercedes 560SL Endures! Durable, and usable Mercedes roadsters. Design are all hallmarks of the Mercedes 560SL.
Run that lasted for 18 years, beginning in 1972 with the US introduction of the 350SL. The 1972 350SL became the iconic 450SL in 1973 and continued with yearly improvements through 1980.
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