Try the guys at http://www.photavia.com
, they might still have some left.
Kodak told me that the last batch of K25 would be produced in July (at least in the UK), so you should still be able to find some.
There is also a place that does mail order in Guernsey http://www.7dayshop.com
but I think that they only ship to UK addresses, but it might be worth asking.