Last time this deal popped up I bought it...and I've been enjoying my mac & cheese ever since, so I thought I'd share!
Right now on Amazon you can get a 15-pack of Kraft Macaroni & Cheese for $9.77 when you choose the subscribe & save option. (You can cancel at any time after your order ships.)
This comes to only $0.65 per box, which is a fabulous price. Regularly grocery store prices are usually over $1/box!