I found Mercury Meltdown for the PSP Instore at my local Currys with a price of £4.97. When i got to the till it came up at £2.97, Bargain!!!. This should be for any store which has them left in stock.
I have checked online but it is not listed, so it must a clearance item. Not bad for £2.97 though.
Hope this works as this is my first post.