We have almost completely converted over to rechargeable batteries, ’round here, but there are still times when alkaline will do. Plus, when the kids were smaller, I often opted for disposable batteries in their objects rather than to risk my precious (read: more expensive!) lithiums being lost in the toy box.
If you use alkalines, here’s a fantastic deal: Amazon currently has a 20-pack of Duracell AA batteries for just $9.34 shipped when you buy via Subscribe & Save. But scroll down the product page a little before you buy—there’s a coupon for an additional $1.50 off! Just click the “Clip this coupon” button to add it to your cart, then buy via S&S. End result: 20 AA batteries for $7.84 shipped, or just under $.40/battery.