Quote from ids:
Please, look at CME information at
http://www.interactivebrokers.com/en/trading/exchanges.php?exch=cme&ib_entity=llc
and
http://www.interactivebrokers.com/en/trading/marginRequirements/margin_amer.php?ib_entity=llc
Our current offering is much bigger and all identifiers are clearly presented. If you want to deal with the floor, chose CME, not GLOBEX as an exchange in TWS menu.
I see some commodities into the tradables list, but not into the margins list: pork bellies, lumber...
