Recently I started paying my bills pretty much ON payday. So the money comes out of my account pretty much immediately and I don't have the money to do any impulse shopping.

That said... this doesn't always work and some days... I just don't give a damn about my bills and will buy whatever I want.

Also, what really helped for a while was to ask myself "will my therapist be mad at me if he were standing here watching me buy this". Usually the answer was "yes"... and that tactic only worked some of the time.