1. Be wary of overdoing it. It is much easier to overspend when you are shopping online. You start to rationalize that you can spend more for those shoes because you saved money on gas and the food you would have gotten if you went to the mall, for example. Give yourself a limit and stick to it.
2. To help protect your credit, use only one credit card for online purchases. This will help you quickly track your spending habits when the credit card statement will come in the mail. If you notice any charges that you simply did not make, call the credit card company immediately and report it to them.
3. If you find a fantastic product on your favorite site, search for it in the search engines before you buy it. Make note of the model number or brand, and do a quick search to ensure that you can't have it cheaper from somewhere else. You might be able to save a few dollars like that.
4. Transform it into a habit to register for price alerts. This goes even for purchases that you've recently made. Price alerts will let you know when a product has dropped to a price you want. And if you've recently purchased at full price, you can ask for a price adjustment to meet the new deal.
5. If a company has a newsletter, register. Often, companies will give sneak peeks, promotions and discount codes to people on the mailing list. However, be careful. You don't want to sign up for every company's newsletter or you'll soon be buried under endless emails. Only join a company's newsletter if you really like their products and would use a discount code.