Hey, Thundering . . .
I lived in Ireland for a couple of years, and found a couple of great resources for children's writers through the Writers' Museum on Parnell Street, Dublin. If you're anywhere in that area, you may want to give them a try, too. (Or google them -- there's a great newsletter, too.)
As for the IRC's, they've basically disappeared. They don't seem to exist anymore (at least not in Ireland or in the Netherlands) and haven't been around for awhile (I've been asking about them since 2001). And, since the US Post Office won't send postage overseas anymore (and I couldn't figure out how to get postage from England -- what a horrible website they have!), my best advice would be to try eBay for foreign postage. I'm lucky in that my parents will send me American stamps, and I have an English friend to goes home for a visit twice a year (I give her some money, and she buys some stamps for me). If you know anyone who is travelling (or anyone already in the countries where you need stamps), maybe you could ask them?
Sorry if that's not much help.
I would also recommend that you get involved in the local SCBWI -- even if no one else writes about anthropomorphic animals, having connections to other writers is always a good thing.