For ITPS, just go on <a href="http://www.itps.uk.com/profile.html" target="_blank">www.itps.uk.com/profile.html</a>
Also when speaking about costs, consider that it's not in the same category as, say, a type rating ! An organisation (government, air force, company)will have to pay for your training and you must be sponsored by one of those organisation(usually in the "big ones": ETPS, USNTPS, EPNER...)
Yes, in some case (Bombardier, Dassault) those companies hired experienced pilots for ferry flights or other duties, and felt the need after to send those people they had learned to know, to the course to get them a test pilot licence
In many countries they prefer to train fighter pilots as test pilots, and they will fly the big aircraft. Very seldom will they take transport pilots - because usually they fail the course when it's time to fly a little bit agressively.
And taking airline pilots is simply out of question, but they have been flying their thousands of hours on autopilot only, which is irrelevant to the task
But believe me, when you are a test pilot and after many years in the business, your time has elapsed and rather to spend the rest of your life in meetings, you choose to go to the airlines... they will make you pay for that! (because they know what I've said in the former paragraphs!)