These are normally about 6 pounds each - sometimes you see them half price at the supermarket - but they are available at the 99p stores right now. They do appear to be grey imports from the orient - but i'm sure they are 100% identical to the local product. They have English stickers on them to comply with UK legislation.
I've seen these on eBay for 5.99 - with the same stickers. No doubt sourced from 99p stores and being re-sold.