Honestly, you have to change yourself rather than relying on something or someone else to fix the problem. You have to break your shopping habit.

The closest thing to what you want would be an online account, such as a savings account, at Ally or similar firm. No physical location to go into to get money. Don't get a debit card so you can't spend the money. Looking at your balance means going online and having to input a password to get access to account information.