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Who is the least expensive online Commodity Broker with the lowest commission rate? - farr financial comission

I currently use financial Farr, pay $ 18 per option contract. Farr OK. "Expect nothing special. I care for, this is not my first rodeo, if I am a funny question, I answer quickly and accurately. The answer is usually" huh? "But it is not easy questions, as we do. I usually get in a position in the berries, or soft, for the sale of a put option. From time to time I will assign the contract, I am looking for the cheapest online broker commodity prices for grains and perishables and options contracts. I understand the many accusations are the industry standard. Thanks for your time.