Um... let me clear things up. OS 10.0 cost me $129 when it first came out. The UPGRADE to 10.1 was free. You just had to have one of those thingy's that is proof you bought OSX (OSX comes with like 3). Otherwise you had to buy the full version of 10.1 for $129. 10.2 cost $129 no matter what and same for 10.3. I am not sure what they will do with 10.4.