How many volumes/Cd's of the "One Tree Hill" soundtrack were released?

Hi, I got into the show "One Tree Hill" after it was on 4 seasons after watching the show on SoapNet (I didn't even know I had that channel until I was channel surfing and came upon it by chance) and it has quickly become one of my favorite shows. However, I know that the show was on The WB network before The WB and UPN combined to form The CW network. So, did that have an impact on what soundtracks are available? I would like to get all of them, but I want to know what ones are out there and I've come across a few but I don't know if they're all from the same series. For example, I found one soundtrack that said "One Tree Hill" Soundtrack, one that said "One Tree Hill" Volume 2 Soundtrack, and one that said "One Tree Hill" Road Mix. Are these the only 3 cds out there? I wasn't sure if the switch from The WB to The CW would have effected merchandising and if items marketed under The WB would cease to exist, or if they'd continue to be marketed under the new conglomeration. Thanks for your help. Have a good day. :)