Online gambling is not cheap. The largest expense that you are likely to have is the money that you place in a bet for each round at the table or each spin of the slot machine. The costs here range per game and depending on the amount of money you want to actually bet. Some have set betting limits while others do not. In addition to this expense, you may find others that are also important to keep in mind.
It is rare, but some casinos do have membership fees, fees associated with depositing or withdrawing funds and other fees for using their website. As you consider which casinos you should be playing at, you may want to look for those that are least expensive. Better yet, respond to those online gambling websites that allow you to play the game without costing you anything and offering you a promotion or two to get you to sign up.