Amazon offers Prime members TurboTax Deluxe Federal + E-file + State 2013 for Windows and Mac bundled with a Refund Bonus Offer for $39.99 with free shipping. That's the lowest total price we could find for the software alone by $9. The software guides you through your personal income taxes; it includes five Federal e-Files. The Refund Bonus Offer is valid on the purchase of an Amazon gift card via a portion of your federal refund made through TurboTax, adding an extra 10% to the value of the gift card. (For example, apply $500 of your federal refund toward an Amazon Gift card for a final gift card amount of $550.)