Are you referring to the QTP courses offered by Mercury Education Sevices? If so the QTP 6.5 Professional Suite class (5 days) costs a base $3000. Sometimes they have promotional offers and the cost is lower. You can also split the training into two sessions: Basic (3 days) and Advanced (2 days). Basic is $1800 and Advanced is $1200.
For detailed info, go to the Mercury Website and navigate to the Education Services page.