According to the ever-so-humble Atlus:
Want to own the complete PSP Persona collection, including Persona 3 Portable, which is tied for the second-best-reviewed PSP game of ALL TIME, according to Gamerankings.com? It is now far more affordable to do so. Also getting a drop in price is the very recent Persona 2: Innocent Sin, a stunning handheld remake of one our company’s most highly anticipated games!
Full article, with pricing of their games, can be seen on the PSN blog.