Because I think I've got those. Sort of matching books, one acoustic, one electric. The ones I picked up (not Costco) were a few years old, too, I think. I'd have to check.
I have a love-hate relationship with Costco. I work right by one, so I run in often to grab one or two things. I LOVE their Spicy Orange Chicken in the frozen section. Their duck is decent, except they didn't have it the last time.
The "hate" part stems from the fact that I'm there to buy a few things and I get stuck behind the woman with two shopping carts filled with food to feed an army for a month (and her screaming kids in a third shopping cart). I JUST WANT TO PAY FOR MY SPICY ORANGE CHICKEN!!!!