Step 1 open a MyNintendo account at Nintendo.com if you don't already have one
Step 2 register your Nintendo DS with your Mynintendo account
Step 3 Go to this link
http://www.nintendo.com/bestbuyds/
Step 4 follow the link to Bestbuy's website that Nintendo gives you and order your games
*Not yet confirmed whether it works with Pre-orders or not*
From Nintendo's site:
"Online only offer. Savings will be reflected in your cart when all promotional requirements are met. If you remove any of the qualifying items from your cart or cancel all or part of your order, you will not receive the promotional savings. This offer is not valid in combination with other offers. Offer good only at BestBuy.com; promotion not valid in store. Offer may only be redeemed once during the two week promotional period. Shipping charges shall apply to free item. Items must ship to a single mailing address. Items may ship separately. Promotion expires on September 15, 2006. Offer subject to change.
Offer good in the U.S. only (excluding Puerto Rico). Offer is valid only to My Nintendo members who have (a) registered a Nintendo DS, and (b) become or already are members of BestBuy.com. Promotion applies to Nintendo DS titles only. Free game must be a Nintendo DS title of equal or lesser value that BestBuy.com has in-stock. All three games must be purchased during the same transaction."
Step 2 register your Nintendo DS with your Mynintendo account
Step 3 Go to this link
http://www.nintendo.com/bestbuyds/
Step 4 follow the link to Bestbuy's website that Nintendo gives you and order your games
*Not yet confirmed whether it works with Pre-orders or not*
From Nintendo's site:
"Online only offer. Savings will be reflected in your cart when all promotional requirements are met. If you remove any of the qualifying items from your cart or cancel all or part of your order, you will not receive the promotional savings. This offer is not valid in combination with other offers. Offer good only at BestBuy.com; promotion not valid in store. Offer may only be redeemed once during the two week promotional period. Shipping charges shall apply to free item. Items must ship to a single mailing address. Items may ship separately. Promotion expires on September 15, 2006. Offer subject to change.
Offer good in the U.S. only (excluding Puerto Rico). Offer is valid only to My Nintendo members who have (a) registered a Nintendo DS, and (b) become or already are members of BestBuy.com. Promotion applies to Nintendo DS titles only. Free game must be a Nintendo DS title of equal or lesser value that BestBuy.com has in-stock. All three games must be purchased during the same transaction."