Subway via CashStar offers a $50 Subway Gift Card bundled with a $10 Subway Gift Card for $50. (The $10 card will be automatically added to cart, and both cards will be delivered via email; the $10 card will be arrive within 48 hours of purchase and doesn't expire.) That's a savings of $10. Deal ends December 25.
These steps will help ensure you don't outlive your money.