Go under the TOURNAMENTS heading at the top of any WGT page.
You'll see this:
Click a tournament with an entry fee and click LEARN MORE --^
That will show you the prizes. The purses with little gift icons generally contain prizes or gift cards. The gold CR are credit purse tournaments.
Some tournaments are restricted to certain Tiers and some tournaments are month long multiround tournaments that have already begun. Starting Feb 1st you'll have a slightly better selection.