EDIT: Woot munges up the link. If you're seeing $18.00 as the price, look a few lines lower on the page for the "5 new for $5.87" link and go there.
Note that these are from Amazon Warehouse Deals and will have an expiration date of 8/26/2012. But K-Cups stay good for quite a while.
Free shipping with Prime or with $25 order.