STK STKPC40 STK 40-Pack Extra Thick Power Clean Magic Eraser | $15 | Woot | Free Shipping for Prime Members, $5 for non-members

Pick up this 40-pack of extra thick magic erasers for $15 on Woot today, and you’ll spend just 38 cents per eraser. These aren’t the well-known Mr. Clean brand, but these erasers do have a 4.2-star rating on Amazon, so I’d say they’re worth a try, especially for Prime members, who will get free shipping.

But even if you’re not a Prime member, you’ll save $4 off the usual 40-pack price.