请帮忙翻译这句话成英语：您好！我想请问一下现在RETRATOME REM-700的价格是多少？谢谢

这样说比较符合英语习惯：
Excuse me,could you tell me the current price of the RETRATOME REM-700?

Hello!I want to the current price of PETRATOME REM-700.
或者 Can you tell me the current price of PETRATOME REM-700.

Hello, Mr(Miss) xxx
Could you please tell me the quotation of petratome (REM-700)for now?

Hello, I want to know present price of RETRATOME REM-700 ?

Excuse ! Could you tell me what the price the Tetra Tomerem-700 is now?