I've received a few requests on where to get some good trading pit photos and one suggestion, for CBOT and CME trading pit photos is through Barnes Photo Ltd. and here is a link to his galleries although you have to look through them to find the trading floor ones. Click Here
Of his galleries, my particular favorite is of the eurodollar pit as it was the largest trading pit ever and it's where I traded. Click Here to view
In full disclosure, I do not know the photographer and am just pointing it out to help requests. The prices are much more reasonable than to buy photos from other sources like Getty Images.