Hello!
My name's Ivan Lavrentjev. I'm Estonian coasters collector. You've understood this correctly - I'm not interested in any other coasters, except Estonian ones.
This's my humble collection homepage, You can see here my beermats, along with fake coasters of Estonia. I know exactly about existence of ca 350 diffirent Estonian coasters. I've got pictures of some, but several were never seen by mine and in this question I can only rely on other collectors' stories. Pictures of Estonian beermats, affordable for exchange, are also accessible.
If You'd like to buy some breweriana, you can follow this link to Estonian online auction 'osta.ee' and check for updates of my stall. All the comments on beermats of Estonia or scans of ones, You've not found here, are warmly welcomed.
Best wishes, I. L.