1. Read customer testimonials before you buy anything. People are more than pleased to complain about bad service online, so search for sites and testimonials which can be terrible so that you know what you're getting into. You should take bad reviews with a grain of salt, but if you see many, you know you will find a problem.
2. Do not spend too much money on shipping. Shipping charges can really add up. Many sites offer free shipping, free delivery once you spend a certain amount, or possess a coupon code that lets you get free delivery. Instead of paying your hard earned money on shipping, look for a store that ships for free.
3. Make sure that you're entering your payment details on a safe and secure site. Search for "https://" within the URL of the site that you're trying to buy something from. If you don't see that or no indication of any website security, then it's probably a good idea not to trust those people together with your account information.
4. Before going shopping at any online retailer, do a quick search for promotional codes. Most of the big retailers often have promotions running which are not advertised on their own home page. Performing a quick search for these codes will allow you to insert the code at checkout to save money.
5. If you are looking at purchasing coming from a seller the first time, take a moment to carefully examine their past customer reviews. Typically this provides you with an approximate idea of which kind of goods and services you need to expect yourself. Anyone who has been rated lowly time and time again should be given a wide swerve.