Newegg offers the Brother TN-450 and TN-420-Compatible Ink4work Toner Cartridge in Black, model no. ST-TN450, bundled with Total Defense Premium Internet Security 5-Users for Windows for $49.99. This $60 mail-in rebate yields a $10 profit. With free shipping, that's $9 under the best price we could find for a similar cartridge alone elsewhere. This cartridge yields approximately 2,600 pages. Offer ends April 30.

Of note, Total Defense Premium Internet Security must be activated before the rebate can be redeemed, which involves providing your credit card information. However, you can cancel the service at any time within the first year without incurring any additional charges.