A Belgian website, consoleshop.be, is currently listing prepaid PSN cards in both €20 and €50 denominations. As Edge points out, the release date is pinned as October 1st, the same day that the UMD-free PSP Go handheld launches. SCEE hasn't officially announced plans to sell pre-paid PSN cards in Europe, but it seems like a no-brainer with the expansion of PlayStation Network content on both the PS3 and PSP. Offering PSN cards will not only make it possible for consumers without credit cards to enjoy digital games, retailers can also benefit by earning some money in the PSN-exclusive transaction (assuming they sell the cards at a profit, of course!).
Hopefully, it won't be long until SCEE does the right thing and makes it official.