Is there something that you buy again and again, yet no matter how many you have, you can never find one when you want it? For me, the top two contenders are nail clippers and chapstick. The chapstick situation is so bad that Cait and I give each other chapstick routinely as gifts (e.g. in Christmas stockings - in our defense, each of us is particular to a brand that is difficult to find). But the nail clippers drive me MAD. I swear I have bought HUNDREDS of them, but they always vanish. If we ever move from this home, I bet I'll end up with a moving box full of them.
How about you?