Waterproof mattress protectors - is there anything better and/ or cheaper than these ones?

[LittleBellasRingingInTheNew]

Medifix ones with side protection

These look the business but I don't want to buy them until the collective wisdom of Mumsnet tells me there's nothing better. What I love about these, is the side protection as well as the top. Anyone know of anything equal to these cheaper? (I need to buy 3, so it's sixty quid, so it matters if you know of one a fiver cheaper!)

Thanks!

I have bought all my DC's these

How are they? Do they have side protection as well? (My DD wet the bed the other day and some of the wee went on to the very side of the mattress)

They are a fitted sheet so cover all the mattress. You put the normal sheet over it.