Back in the day, American Express was the credit card of choice for many but now they have been overtaken by VISA and Mastercard. Yet they still have plenty of users and plenty of operators allow this credit card to be used to deposit funds into your sports betting account.
This is where you physically deposit or withdraw money in person at the casino which is partnered up with your online sportsbook operator. All sportsbooks will have a physical location where you can go to do anything you require regarding your online betting account.
Like Neteller, Skrill is an e-wallet that allows customers to have access to their money instantaneously. Once your account is created, you can use their service to deposit into your Sportsbook account.