I saw these in currys altrincham retail park (0161 941 2295 thanks to saynoto0870.com)
they had plenty of stock in a basket at the end of the games aisle. product code is 975362 and cannot be seen on the web so " OFFLINE ONLY" they had psp versions for 4.97 if anyone interested. They mave have version 5's in the basket as both me and my son are sure they were v5 but on phoning for prod code the girl said the one she had said v4, no shouting please i am just telling all i know. the link is to amazon as they have the v4 in stock for £24.99 and v5 for £14.99 as i said there is no link on currys website i could find, good luck.