Most casinos give monthly or reload bonuses. These are not always publicised and are often dependent on how much you play. There are some that will just give every player an amount though regardless of the amount of play.
To get the the best monthly casino bonuses, you really need to look at the VIP schemes. They offer bespoke bonuses to regular players every month.
Here is a list of regular monthly bonuses/ reload bonuses. Please check if they are available for roulette as the rules often change.
138.com £138 100% Cashback Monthly
This offer isn’t only just for new customers, its for all customers, each and every month. This is for the live casino only.
Totesport Casino 50% up to £50
50% Monthly Bonus from Totesport casino.
At Bet365 you can get 20% every time you deposit using the bonus code BONUS3000. Claim up to £3000 a month.
Dublin Bet Casino
When you deposit between €1 and €300, you can collect a 10% bonus.
If you deposit €301 or more, you can collect a 15% bonus.
Earn between £5 – £3,000 bonus in REAL CASH every week. The amount is not specified but if you play one week, you get a bonus the next week.