Tesco has a sale on their single and double mattress protectors, which are reduced to £3, although I don't know what from. The king size is £11.50, so it seems a decent amount cheaper.
Double mattress protectors are there to make your bed feel just like that. Defending against little stains or accidents, they’re easy to whip off and wash – and they feel so fresh and squashy when they’ve been line-dried! They’re brilliant for putting onto an existing mattress – especially a used or rented one – to give you a feeling of cleanliness and ownership.
The Age UK Maxi Protect Double Mattress Protector, provided by Incontinence Advisors is designed with maximum user comfort and protection in mind. The Polyurethane cover acts as a low-noise, fully waterproof shield to prevent any fluids seeping through to the mattress should any accidents occur.
A double mattress protector is ideally put on when you buy a new mattress, as you’ll get the longest life from both. You can expect Soak&Sleep double mattress protectors to carry on for years: we know they’re real investments. Every protector in our range has been carefully considered and researched, then made to last.