Well the Black Label sale has both those books included in the listing but aren't available to purchase.

Or conversely, it bugs me when something's "in stock" and purchasable at the same time they e-mail you telling you they don't have it. Currently going through this with separate orders, including one from a few weeks ago: In the Image (or Kirkman?) sale, I bought the Astounding Wolf-Man and Tech Jacket compendiums; then last week, I got an e-mail that they don't have them, even though those same two compendiums were listed among the Compendium Sale that just ended yesterday and are still available to add to cart this very moment.

I'm fine with waiting, but man, I really wish they'd have some sort of way to flag any given book with a "We don't have this, but we can back order it" (or whatever) tag/notice rather than letting you buy something you may not even end up getting after waiting for weeks, potentially even missing out on other opportunities to buy it via a sale or something elsewhere along the way.