I am helping a friend get moderately up-to-date with a Powerbook. (Don't have specs with me.) Assuming it can run Leopard, where can I purchase an upgrade? It's pretty hard to find non-Snow Leopard products at least online. (Heck, it's hard to search for non-Snow products including in this forum.) I found a full version for $120 at Fry's. But that probably isn't worth it for my friend. Are upgrades no longer sold? http://www.frys.com/product/5833943?site=sr:SEARCH:MAIN_RSLT_PG TIA!