Online casino Liberty Slots is boosting the prize pool for its popular weekly blackjack tournament. The contests have proved such a hit with fans that there's now $750 on offer each week-long event, all for a buy-in of just $5.The tournament action starts every Monday and runs until the following Sunday with the players building the biggest scores taking home the largest share of the loot.The next tournament gets under way on Monday 15 September on the Atlantic City Blackjack title.Blackjack isn't the contest running at Liberty Slots at the moment. Players have until the end of September to rack up a big score on the Funky Chicken slot to be in with a chance of bagging a share of the Autumn Jackpot which stands at $30,000.Also proving popular this month has been the site's Bump It Up Joker Poker where players can play up to four hands and advance to the next hand when they're dealt a winner.New players from around the world can join in the action with a casino bonuses worth up to $777.