For your convenience, here's your one-stop shop for Kirby items available from amazon.com. Purchasing them from these links of course also kicks back a few percentage points of the purchase price to me, allowing me to buy future Kirby releases and post about them here. Even if you're using another vendor, these links are useful for providing you with an ISBN and a price and cover. Also note that some of these items (especially Marvel books) will drift in and out of print. Most of the last two dozen books are currently out of print completely but you might be able to order second-hand copies.
For more details on these books, specific recommendations and Kirby content, as well as Kirby items not offered through Amazon and Marvel Masterworks hardcover volumes, check out Kirby in Print page.