Hi Dan. Thanks for your question. By default, Covenant Eyes® isn't going to block a shopping site that isn't explicitly pornographic in nature. As a result, combatting shopping sites would take some work on the part of you or your Filter Guardian in order to get them to block effectively and the only pieces of advice I could give are common sense ideas that you likely have already thought of. First, if there is a site that is a temptation for you, add it to your block list or have your Filter Guardian add it. Admittedly, this will require diligence on your/their part as there are indeed many shopping sites online.
Additionally, make sure that your Ally is set up to receive your reports regularly and that they are going through to the email on file. Even if a site goes through, knowing that your Ally will be viewing the report later should be a helpful deterrent against temptation.