The Harlequin Jack-in-the-Box Collectible exclusive to GameStop customers only!
Two Exclusive In-Game Single Player Maps
Hard Copy Strategy Map of Rome
Exclusive Art Book
New SKU# 200894
Pre-Owned SKU# 952722
New copies ($29.99) should be labeled as "Pre-Owned" and you can use your PowerUps Pro card for an additional 10% off ($26.99).
The website has them listed as $49.99, so it might be YMMV. I am not sure if the PS3 version is the same price. I was able to pick up one at my local store. It was the last copy they had.