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And now you wish you could have bought everything for 100?
Not really. The first and second big hardcovers were $20 and $25 respectively. They collect Invincible Iron Man 1-19 and 20-33, or the first six hardcover books. At ~$8/hc book that's $48 for those 6 books, so I saved $3. Admittedly not much but still savings!
Still I think $100 is a great price for all 12 books considering the second half of the series has yet to be released in big hardcover format.