sealed bath ducks

[MamaLaMoo]

Anyone know where I can get rubber duck bath toys which are sealed so they don't fill with water and start growing the evil black mould?

I have had to bin some cheap yellow ducks after the mould took over and would like to get something similar as a stocking filler for DDs.

Superglue their butts. It works, but sometimes they float upside down.

I think they probably all have a little hole to allow for air pressure changes. The black mould is not pretty, but it is harmless AFAICT.

The ones that flash don't have a hole in. I have a brilliant sealed duck made circa 1973 which is STILL going strong!