BestBuy.com has the Seinfeld: The Complete Series DVD Set in "Refrigerator" Box for $99.99. Select in-store pick up to save on shipping, otherwise it's $2.49 to ship.
Note: The item description does not mention "extras" (besides the DVDs) but some of the reviews on the item page do. Be aware that this may or may not be the case, so your decision to purchase should not hinge on this.