Gamefly's digital distribution storefront Direct2Drive is offering a discount code for 20% off your entire order, including sale items and preorders, today only as a part of their 12 Days of Christmas promotion. Notably, you can use this discount on Mass Effect 3 Standard ($47 after discounts) and Digital Deluxe ($58 after discounts) edition preorders, which are already 10% off. The 20% discount offer is in effect for both D2D's US and UK/Europe storefronts, although they use different codes.
Use promo code SURPRISE20
Use promo code FESTIVE20