Instruct: Classify a given review into positive or negative sentiment.
Query: Go directly to Apple, by phone

I just verified S. Hiss' comments from April. If you are a registered Mac owner, you can avoid the over inflated prices of some of the 3rd party resellers. Call Apple at 1-800.my.apple where you can purchase a copy of OS 10.5.6 for $129, plus tax, with free shipping.