If you want even cheaper ones for the kids, our Poundland has had some for quite a while, a couple of years ago they had some of the waterproof ones as well which were great for the water parks and we got some quite good pics with them.

One tip if you are giving them to the children is to write the surname and either mobile or home phone no or e-mail address on the camera in permanent marker (we always used to do this for school trips for our daughter) then if they put the camera down and forget it, then you can be contacted and arrangements made to forward it. If none of the pictures have been taken, it doesn't matter if you lose it but if the camera has been almost fully or totally used then many people realise that they may be irreplaceable pics and try and contact you.

Also a handy idea for expensive toddlers shoes as well if they have a habit of kicking them off.