There isn't much difference in the price to theplay.com deal I posted a few days ago, but it is the cheapest price nonetheless.
Cashback rate with dvd.co.uk is not as good as play.com, but because of the cheaper price to start with, it still works out cheaper.
If these are the exact same product that play.com supply(I have no reason to think differently) they will work perfectly for use in the Sony PSP console.
They are supplied with a Micro M2 to Pro Duo adaptor.
SanDisk Memory Stick Micro or "M2" is the ideal memory card solution for Sony Ericsson's new generation of slim line, multimedia mobile phones needing expandable storage for music, videos, and quality photos. The advantage of the M2 is compatibility with all M2 slotted mobile phones as well as all Memory Stick PRO Duo slotted devices when accompanied with the included M2 adapter.
Speed Rating: 10 MB/s (read) 3 MB/s (write)