PRP starts at about $800 out of pocket. Do not let anyone's skeptics throw you off on here, none of them have a clue especially with PRP. Cortisone shots will be a thing of the past in the next 5-10 years, and will be replaced by Bone Marrow Extracted Stem Cells from the Hip Bone. In fact, cortisone can actually max out in the long run and does nothing to "cure" the problem.
Not all orthos have a clue about regenerative medicine. In fact, two might have the exact opposite opinions. Mostly because this stuff is fairly new within the past 10 years and theres no one studying in professionally in their med schools. How do I know this crap? I have had 3 knee surgeries in the 6 months on my knee and ive seen three different orthos including Dr. C who you are seeing now, i am still on crutches.
The Steadman Clinic is has a better understanding and background of regenerative medicine than most clinics in the United States. They have a multl-millon dollar research facility at the bottom floor of the Vail Valley Hospital. The future of knees lies with regenerative medicine, we are close but yet so far, mainly because of the government and FDA. Other countries are ahead of us.
Newschoolers is not the best forum for this. Most parks kids are so young they dont run into this problem. Check the Teton Gravity GIMP Central forum for more skier based research on PRP. Basically PRP just spins the blood and then puts it back in your knee. You can also look into Prolotherapy, thats what Tanner Hall and Bode Miller used.
Good luck and just be thankful you knee is not any worse. I will out from skiing for about 14-15months.