I'm honestly not aware of any reputable surgeon or facility in the U.S. where you can have a tummy tuck and breast lift or augmentation with properly-trained and credentialled staff for your desired $6000 price.
The old saying, "if it's too good to be true..." probably...
First off, make sure you go to a board certified plastic surgeon for any plastic surgery. There are many cosmetic surgeons who may not be trained in plastic surgery who still can offer you surgery. Second, don't let price drive you to have surgery from a surgeon with whom you are not...