All actual prices are shown in timetable search results reachable from left pane of this page.
The pricetables divided by routes and price classes are following (tables will open in PDF format)
Tallinn-Tartu , first and second class
Tallinn-Tartu, economy class
Tallinn-Viljandi, first class
Tallinn-Viljandi, economy class
Tallinn-Pärnu, economy class
Tallinn-Narva, economy class
Tartu-Orava, economy class