For /ES, AMP charges me $2.05 per contract (Exchange $1.18, NFA $0.02 Clearing $0.5, CQG TRF $0.1, Commission $0.25) while TDA would charge me $3.45 (Exchange $1.18, NFA $0.02, Commission $2.25). For round-trip trade, it's $4.1 vs. $6.9. That means total /ES trading cost of TDA is 68% more...