Lets always depend on the casino you are playing at. But usually, bets can be as low as 10 pence. It is wise to pick bets that are within the budget that you can afford. These bets you can afford to lose and always mind chasing your losses. Chasing your losses will lead to a gambling problem as well as to more losses. So when you have been losing consider dropping out of the game. It is better to continue another day or time when your mind is in a better condition.