Hall in Tirol to Venice

We need to get from Hall in Tirol to Venice and would like to take the train that leaves at 9:07. There are trains that leave every two hours, but we really want to be one this one. I cannot find a prices listed on OBB or Trenitalia, but through RailEurope it is $180.00 two adults one youth under 26 yrs.

Question: (1) Can anyone tell me the actual price if we wait to buy it there directly from OBB?

(2)Would you recommend waiting until we get there to purchase or do you think one train every two hours is so few that we may have trouble getting on the 9:07, so we should spend more $ and purchase now through RailEurope?

I appreciate any advice! We will be in Austria about a week before the travel date.

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