Hmm, I',m not really sure if the 55 will be in a similar price range - though the only reason it very well might be, is because the car's are imported in small numbers, and re-sale is a bit on the tough end - owners demanding more than its actual worth, and buyers wanting to get the cheapest deal for their buck.
There were two particular SL's, '04-'05, one 55AMG, and the other was a 500, in Karachi - both were on sale, lets say a year and a half ago.. But I'm not sure what the deal is now. You're better of trying private individuals willing to sell rather than dealers, unless you want to get it imported yourself, etc. Ask around, you'll come up with something - and when you do, post pictures!