You are much better off to buy a sony branded mic then a logitech or off brand.  People online that have scratchy voices or have a loud pitch heard when they are talking have a cheaper mic.  The Sony is of better quaility and is not much more.  Don't skip out and save a couple bucks, when it won't save you in the long run.  You can get the originals anywhere the psp is sold and even eBay.