About two years ago I encountered a Vlad somebody-or-other on the then fairly active
http://lists.aquaria.net/fish/livebearers
Vlad, a.k.a. Scott Lockwood, was looking for Endler's livebearers and I was able to get him a few. I figured he would be a zillion miles away and I think we were both surprised to find that he lived about 35 minutes away from our home which happens to be in the far Southern Suburbs of Chicagoland.
I remain active in the AKA, ALA, the Chicago Killifish Association and cordual with a number of aquarium clubs in the Great Lakes region. We miss out on "Lake Water" which is so useful in aquariums. The liquid rock from our municipal wells serves the livebearers well enough. We have an R.O. unit so water for some other fish can be fiddled with.
By the way, the more active livebearer mailing list in the U.S. now seems to be
AmericanLivebearer@yahoogroups.com
It is still fairly quiet. That first list took a real hit from an attack on their server, lost the archives and has never really recovered. :(
But it's nice to be able to palaver with livebearer enthusiasts on Guppylog. Glad Scott and Reza put out the welcome mat.
Also took DJ's suggestion and dropped by late to the www.aquachat.com chat room yesterday. The pace reminded me quite a bit of the About.com freshwateraquariums chat room during it's hayday a 3-4 years ago.
All the best!
u.s.