Should be "how much does lörtsy cost"
Same opinion here. Why "do the"??? Do and does have a very specific and simple use in English, in this case "it does", "does it cost".
Lörtsy is certainly not common, what is it???
I suggest you to change to a more useful word, thanks
Are you really sure that the English plural of lörtsy ('lörtsyt' in Finnish) is 'lörtsy'???