Hola Laneros, No se si es un off-topic, pero me parecio interesante compartir esta información que me llego:
AMAZON.
Buy Two Games, Get One Free
For a limited time, buy two games, get one free. Choose from hundreds of eligible titles below. Simply add three titles from the lists below to your cart and proceed to checkout. Limit 2 of the same item in a single order. See full terms and conditions below.
Note: You may need to add the games to your cart separately if they are not on the same page.
Terms and Conditions
To Receive the Promotion:
1. Add all three items referenced above to your Shopping Cart.
2. When you're finished shopping on our site, click the "Proceed to checkout" button in the Shopping Cart. Your shopping cart must include all qualifying items during the checkout process to qualify for this promotion. Additional conditions are listed below.
3. On the final checkout page, the discount will be applied to the lowest-priced qualifying item. A promotional credit for the discount amount will appear in the upper right corner of your Order Summary.
Terms and Conditions
• The promotion is limited to one per customer.
• Customers are limited to a maximum purchase quantity of 2 of the same item for the lifetime of the promotion.
• Promotional offer valid for a limited time only. Amazon reserves the right to cancel it at any time. Items placed in Shopping Cart overnight may not be eligible for promotion at time of checkout.
• Promotional offer applies only to qualifying items listed above.
• Applies only to products sold and shipped by Amazon.com. Does not apply to items sold by other merchants on the Amazon.com Web site. For example, where the promotional offer applies to items offered by Amazon.com, items offered by other merchants on the Amazon.com Web site (e.g. Target, etc.) do not qualify. Does not apply to any products purchased in Amazon.com's other sites, including Amazon.co.uk, Amazon.de, Amazon.fr, or Amazon.co.jp, or in other Marketplaces.
• Applies only when all qualifying and free products in the promotion are purchased in one order.
• Applies only to completed orders shipping to a single address that meet all other promotional requirements.
• Offer good while supplies last.
• No substitutions or rain checks.
• Shipping and handling charges apply to all products, including bonus items.
• Offer may not be combined with other offers, including some promotional certificates.
• Void where prohibited.
• Does not apply to orders placed with 1-Click. The offer may not be combined with other offers.
Me disculpan si esta información no esta correctamente ubicada.
Saludos.