[Grammar] In 2000 dollars OR In 2000 dollar

Which one is correct.
1. I bought these shoes in 2000 dollars.
2. I bought these shoes in 2000 dollar.

I bought these shoes for 2,000 dollars (or $2,000).

An alternative to avoid preposition trouble would be "These shoes cost me $2,000".

Perhaps you mean

'I bought these shoes for $2,000.'

(Expensive footwear!)

You now know that the word should be "for". Note that your first line should have been "Which one is correct?​"

Actually, a friend told me if there is currency in a sentence like ​''dollar, rupee, rial '' after a Number then they are not made plural by adding ''s'' to them. That's why I did not realize that the mistake was with the appropriate preposition.

10 pounds, twenty dollars, fifty rupees, a hundred francs.

Hello, faisaljan.:-D
In addition to Tdol's reply, please look at the sentences below.

1. I have one twenty-dollar bill.
2. I have two twenty-dollar bills.

In these examples above, the word 'twenty-dollar' modifies the noun 'bill/bills'. It is called a 'compound adjective'.
You can't pluralize the 'dollar' used in the compound adjective:

I have one twenty-dollars bill. Incorrect

(I'm wondering if your friend meant this.)

And some currencies don't take -s: a thousand yen.

I thought he was adjusting for inflation at first. Giving the price of something in (year) 2000 dollars.

SoothingDave said:

I thought he was adjusting for inflation at first. Giving the price of something in (year) 2000 dollars.

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I don't know why you thought this. but if you read the title, it says ''[Grammar] In 2000 dollars OR In 2000 dollar''

The title makes no difference to what SoothingDave thought. The question could still have been a grammar issue over whether it should be "dollar" or "dollars" and SoothingDave could still have thought the OP meant "dollar/dollars as they were worth 14 years ago".

faisaljan said:

I don't know why you thought this. but if you read the title, it says ''[Grammar] In 2000 dollars OR In 2000 dollar''

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Yes, I read the title first. And thought that your question would have something to do with constant dollars. Once I read your question, I knew that that was not the case.

It would be a valid way to use "in" with "dollars," when talking about prices/costs.

"This graph of gasoline prices shows the price of regular unleaded over the past 50 years, in 1964 dollars."

Here is another sentence that probably end this confusion.
1. He gave me a ten rupees note.
2. He gave me a ten rupee note.
some nouns, which take the plural form at ordinary times retain the singular form to express some specific quantity or number.

Did you have a question about the contents of your last post, faisaljan?

No, thanks to tzfujimino .Now I am quite clear about it.

There should be a hyphen: a ten-rupee note.