The following is from Amazon.com:
For a limited time, when you purchase a PSP 3000 Core Pack - Black, you can get a qualifying PSP Greatest Hits title for free*. Offer limited to products shipped and sold by Amazon.com. Offer begins at 12:00 AM Pacific time on 5/10/09 and ends at 11:59 PM Pacific time on 5/16/09. This offer may not be combined with other offers or promotional certificates. Limit one free game per household.
*Tax and shipping charges may apply.
Buy PSP 3000 Core Pack - Black add it to shopping cart, then add one of the three games offered (God Of War: Chains Of Olympus, Locoroco, or Hot Shots Of Golf: Open Tee). Once at the check out, you will see the discount for that game. Enjoy! :D