The best deal I ever got was last night, at a Best Buy. They were selling 55 inch TVs for $100 less than what they were usually sold for. And I bought one. Well, my uncle did.
It was my second year going Black Friday shopping, and it wasn't as chaotic as I thought it would be.
Best deal? Hmm... an iPhone 4s for about 15$. It wasn't on black friday or anything, just a random guy wanting to sell a suspiciously new iPhone for really really cheap.
Although there are some MMO quests that took me months of daily playing to get, and that there are probably some really hard ones I can't think of, I'm thinking the Give Up quest is hardest. No other quest has had my heart beating and sweating that much, nor have I been that determined to get one.