Buy 2 get 3rd free
I also saw this after registering, which requires 1 app less to get the freebie:
Buy Any 2 Books, Games or Accessories, Get the 3rd FREE plus FREE SHIPPING!
Use promo code SOLSTICE through 1/14/2013, 11:59pm PST
Enter promotion code SOLSTICE at the checkout page to get one book, game or accessory for free when you buy 2 books, games or accessories plus get free ground shipping on your order. Sale items and bundles are excluded from discount. Not valid on App Cards, App Codes or App Center purchases. Offer valid through 11:59PM PT 1/14/2013. This offer may not be combined with other offers requiring a promotion code or with other offers or discounts applicable to the same item(s). Discount is applied before taxes and does not apply to tax and shipping. No adjustments can be made on prior sales. No substitutions or cash equivalents. Offer subject to change without notice. Offer void where prohibited or restricted by law. This offer is only valid in the 48 contiguous states plus the District of Columbia. We are not able to ship to Military, APO or FPO addresses or P.O. Box addresses in Alaska and Hawaii at this time. Offer valid in our online store at www.leapfrog.com