Meritline offers this Battery Tester for $2.99. Coupon code "MLCK507DNL1" cuts it to $1.29. With free shipping, that's tied with our mention from a month ago as the lowest total price we could find for this tester by $2. (We listed it for 30 cents less in December.) It tests AA, AAA, C, D, 9-volt, and button-cell batteries. Coupon expires after 500 uses.

Expect this item to take two to three weeks to arrive.