Just a quick note to say that One King's Lane has a terrific price on Charley Harper: An Illustrated Life.
This is the big edition (424 pages, 13x19 inches, 12 pounds). It retails for $200 but is $99 plus an extra 20% off with the code "INDULGE" (good through 1/27/12). I know that's a lot to spend for a book, but I think it's a terrific coffee table book for kids and adults. Harper's illustrations are just so colorful and fun--very creative and something you can look at again and again.
If you want the mini version, it's available for $20 at Amazon, or support your local book store by buying it locally (I know Beaverdale Books carries some Oldham/Harper books). Also, you can read more about Harper and buy his prints here.