I bought some of these earlier on in the year, the place I bought them from no longer stocks them but they are still on the Mayfield site.  They are a really bouncy ball for dogs that causes a splash when thrown into water, a bit like a water bomb ball but sturdier.  I can't seem to find anywhere that stocks them now.

Anyone else know of anywhere.

Found one on google here. You could also try to find a stockist in your area using the manufacturers supplier map.

Many thanks, have tried hours trawling the net with no luck