The minimum withdrawal limit is $20 but this varies depending on the method you use. There are no withdrawal limits for Bitcoin and check by courier.
Rapid Transfer has a maximum limit of $5,000 per transaction plus it charges $25 per transaction. The minimum withdrawal amount for bank wire transfers is $100. While the maximum is $3,000 per week.
Check by mail has a minimum withdrawal limit of $100. It has no maximum cap plus no fees aside from the postage costs. Rather use check by mail than check by courier.