I want to go from Belfast to Galway. When I went to the bus Eireann site it would let me find a bus that went there (via Dublin). However, when I go to figure out how much the trip would cost I can't find a way to buy it.

Any suggestions? Am I barking up the wrong tree here?

When leaving from Belfast you have to look on the Ulsterbus website.

Ulsterbus

For fares click on Goldline fares
For schedule use Journey planner.

Within the Republic use the Bus Eireann site.

Personally I think the train ride is much nicer.

Ok this might be a little late, but I have to get my two cents in.

Do not bus it from Belfast to Galway.

That was the worst 9 hours of my life over here.

My preferred route: Belfast - Dublin train or bus. (2 hours)
Dublin - Galway train (2.5 hours)

So much handier.

just did something to my profile and want to see how it works