Quotes are free so long as your produce $30 in commissions each month.
So at $0.70 per contract you have to do about 43 contracts per month for free quotes. If you only do single lots @$1.00 per contract then you need do only 30 contracts.
Exchange fees do not count in the calculations so I've not included them.
From the IB web site:
US Securities & Commodities
Non-Professional Bundle (Includes all Stock, Options, Futures and Bond markets) United States Free (USD 10.00 market data fee if less than USD 30.00 in commissions per month)
Jack