1. Always save copies of your orders and receipts from online purchases. Many stores will redirect you to a page after you've submitted an order detailing everything that was bought, customer information, the prices, etc. You should either print a copy of this or save a duplicate to your computer in case any issues arise before the end of the return period. Be sure to save any emails regarding your items' status or correspondence with the company regarding your orders, too.
2. Be careful in regards to the online stores that you consider buying from. If the online store is poorly designed, filled with misspellings, and overall fishy, you should take your money elsewhere. These are signs that something might not be right about this store. It's better to be safe than sorry.
3. Before going shopping at any online retailer, do a quick search for promotional codes. Many of the big retailers often have promotions running which are not advertised on their own home page. Carrying out a quick search for these codes will allow you to insert the code at checkout to save money.
4. Pay close attention for potential sales online starting as early as Wednesday. Many brick and mortar stores do sales on the weekends, and to compete, many online retailers have moved their sales days up by a few days. You can often find exceptional mid-week bargains with just a little online research.
5. Read customer testimonials before you buy anything. People are more than happy to complain about bad service online, so try to find sites and testimonials that are terrible so you are aware what you're getting into. You need to take bad reviews with a grain of salt, but if you see many, you know there exists a problem.