I want to buy something which costs 10 dollars. I have only 7 dollars.
Now my question is, Which are the other ways to say that I need 3$ more? Are the sentences below ok?
3$ needed more
I lack 3$
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It would depend on what you are trying to say.
If you wanted to explain that you can't afford it, you might say "Sorry, I'm short by $3", although it would be simpler to just say "Sorry, I only have $7".
If you were a child asking a parent for more money then you might say "I need $3 more", or "I need another $3". Saying "I need..." generally implies that you are trying to get it, so you wouldn't say that unless it was part of a request or some other plan to get it.