there used to be an LDB Broker that would show you how much gold you had up to a certain point and wouldn't allow you to spend more then that without a separate pop up agreeing to the purchase.
Example: 500G would be the only amount that would show no matter how much gold you had. It would also allow you to add 10% of your loots at a time. So if you killed something and looted it for 10g only 1 gold would be spendable up to the 500g mark you set.
This was really helpful when saving for mechano hogs and such and with the new jade mounts coming I'm sure I will need something like this again I just haven't used it in 2 years and can't find it anymore. I think I was even using Titan bars at the time (I've gone to ldb and fortress now).
The main thing is unlike Lockbox, I think it's called. I don't want to see how much I've saved only what I'm allowed to spend.