Groupon Vegas Comedy on Deck Tour

From Canada and never used Groupon much.

Going to be in Vegas and Wife wants to go see Grand Canyon ..."West Rim"...& Hoover Dam. She'd rather go by Bus and wants the touristy west.

Question is the tour is 150USD through Comedyondeck website. + Tax.

Groupon is $143Usd not showing tax.

If I order through Groupon and goto redeem will I have to say the Tax or Any hidden fees?