Correct me if any prices, etc are wrong.
Methodology: Went through US store and noted all titles
currently priced at $15 (don't know if any titles had price drops post-launch). Went to UK store and looked up same titles and their current GBP price. Converted GBP to EUR based on past PS Store releases (don't have an PSN account that uses Euros, so had to self-convert). Release dates were taken from UK PS Store, although were modified if necessary to separate releases (eg, Fat Princess and Watchmen Part 2). Historical USD/EUR conversion rates taken from FXHistory (onada.com).