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 EUR
Tallinn - Tartu, economy class EUR
Tallinn - Viljandi , first class EUR
Tallinn-Viljandi-Pärnu , economy class EUR
Tallinn-Rakvere-Narva , economy class EUR
Tartu - Koidula , economy class EUR