Marriott is about to launch a new promo for buying gift cards. You can get 5 United miles per USD for a maximum bonus of 7,500 miles for buying $1500 Marriott gift card.
This offer is valid for purchases made between August 7 and September 7, 2013, and you can access this offer here.
These gift card are sold directly by Marriott and eligible for Marriott spend bonus, if paid using Marriott affiliated credit cards.
Note that you may not get very good exchange rate, if you decide to use these gift cards outside of the United States.
Here are the terms and conditions of this offer:
United MileagePlus® Marriott GiftCard Offer Terms and Conditions
Marriott GiftCards, purchased in $100 increments earn 500 bonus miles, $250 earn 1,000 bonus miles or $500 earn 2,500 bonus miles allowing a maximum of 7,500 bonus miles to be awarded per member during the promotional period. United MileagePlus member number will be awarded the bonus miles, regardless of purchaser. Cannot be combined with any other offer or promotion. This is an online promotion only and not valid on Marriott GiftCards or eGiftCards purchased on property, via 3rd parties or 1 800 813 GIFT. Shipping and handling fees apply. Promotion is valid August 7, 2013 – September 7, 2013 only.
The Marriott GiftCard can be used for all purchases and services charged to a Marriott guest room folio. The Marriott Gift Card cannot be used to guarantee a room reservation, but may be used as payment at check out. If you are not a registered hotel guest and are planning to use this card at a spa, restaurant, retail store, or other outlet, please confirm in advance that the Marriott GiftCard is accepted. Gift Card purchases earning United MileagePlus are not eligible for return or refund. GiftCards purchased with this promotion are not eligible to earn Marriott Rewards points. While supplies last.
Please allow four to six weeks after date of purchase for miles to post to your MileagePlus account. Terms and Conditions are subject to change without notice. All MileagePlus rules and regulations apply. All Marriott Rewards rules and regulations apply.