Log into you account and go to the tournament page.
Liberty has several daily slot tournaments including one free roll. A buy in of $2 to $5 will gain your entry into others
They also have some ongoing featured tournies:
~ Play for the Pot Mother's Day Tourney runs thru May 14 and has a buy in of $5 and features the game, Cleopatra's Pyramid
~ Spring Chicken Tourney featuring the game Funky Chicken runs thru April 16. There is a $5 buy in and a guaranteed pot of $1000