1. In order to buy a used product online, learn more about the seller first. You need to visit their profile and look for reviews written by other shoppers who bought products out of this seller. Do not hesitate to make contact with the seller to inquire about a few questions regarding the product you are interested in.
2. Read customer testimonials before you buy anything. People are more than happy to complain about bad service online, so look for sites and testimonials that are terrible so you know what you're getting into. You ought to take bad reviews having a grain of salt, but if you see many, you know there exists a problem.
3. Be careful in regard to the online stores that you consider buying from. If the web store is poorly designed, packed 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 safer to be safe than sorry.
4. If you're purchasing clothes or shoes online, be careful with the sizing. Some items typically run smaller or larger than normal. Some shopping sites will advertise if an item runs true to size. If the site doesn't list anything about sizing, glance at the reviews. In most cases, if the item is running larger or smaller, the reviewers will let you know.
5. Make it a habit to register for price alerts. This goes even for purchases that you've recently made. Price alerts will tell you when a product has dropped to a price you like. And when you've recently purchased at full price, you can ask for a price adjustment to meet the new deal.