Dealer is saying I need a new Trans. They want 5800 to fix. Can I get a used Trans? on 2006 Mercedes-Benz R350

My r350 broke down Thanksgiving holiday, still down. Took it to dealer they said I need new trans. Wanted to get a second opinion, got that, they said same thing. Can I get a used trans to put in there?

Asked by for the 2006 Mercedes-Benz R350
$5800 is very reasonable.
Yea, but can i buy a used trans for it?
What and maybe buy some other problems.
MB is a high maintenance and costly repair vehicle.
Ok Thanks for all your help. Income tax is comming up right. lol I probably been better off buying brand new. I think that will be my next move. My whole thing is that I don't think the trans should be going like that in that high in car.
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You should be able to find a cheaper or used transmission. I would recommend fixing it and selling it asap.