Persona 2: Innocent Sin already has a pack-in bonus. Each copy of the expanded PSP version includes a mini-soundtrack CD. On top of that, select retailers in Japan are giving out a set of Persona 2 postcards.
Four cards featuring the game’s main characters are in the postcard set. If you want a more handy bonus item get the game at Gamers. They are offering a Persona 2 themed microfiber cloth with purchase of their 7,2980 yen ($89) package of the PSP version.
That’s actually more pricey than a standalone PSP game and Famitsu’s bundle package, which includes a poster. Konami’s limited edition is currently the highest package and it’s a game plus a Seven Sisters PSP case bundle for 8,800 yen ($108).