http://www.google.com/products/catalog?q=leopard&oe=utf-8&hl=en&cid=6216782935308375362&sa=title#p i'm wondering if these copies of leopard are legit? how are the sellers able to sell them so low? Since i'm using tiger and want to upgrade to snow leopard, and don't need the box set. im stuck with unnecessary purchases that are way out of budget. buying this, i will be able to do the 29 upgrade version. would you trust this?