This is a really hard thing for me and the stress got to be too much not being able to pay the bills. So I put all of my credit cards in the safety deposit box but one in a file cabinet at home to cut down on impulse shopping. It takes more of an effort to get to them. And then I've been trying to supplement the habit with other activities and to stay away from the stores and online shopping with new hobbies to keep me busy and entertained other ways. It's a constant struggle though.