Amazon offers the TurboTax Deluxe Federal + E-file + State 2013 for Windows and Mac for $39.99 with free shipping. That's $13 below our mention from three days ago, which also included a $5 Target gift card, and the lowest total price we could find by $5. This software guides you through your personal income taxes; it includes five Federal e-Files.

Want to sweeten the deal? Use some (or all) of your refund to purchase an Amazon gift card and receive an extra 10%. (Purchase a $500 gift card and you'll receive $550.)