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Well, my immigration people told me the cost for I-140 is 2700 dollars something (with a little increase of the amount). It's not 700 dollars, so that's why I want to wait for a little bit. 
-Nonsense! probably they ask you to pay the lawyer fee also.
Read this USCIS website about I-140 filing fee:
https://www.uscis.gov/i-140

8老師，再問一下，如果我現在決定先交140， 過幾個月，140還沒批，但485排期到了，我可以繼續交485嗎 （without the new approved 140)？
-Yes.

謝謝！