1. Ensure that you're entering your payment details on a safe and secure site. Look for "https://" within the URL from 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 great idea not to trust those people with your account information.
2. Before buying from the new online retailer, perform some research on them. Check online reviews from other customers to see the actual way it handles stuff like customer service, shipping, and its overall buying experience. You can also look into the BBB to find out if it has any disputes and whether those disputes were resolved professionally. Try contacting the company via email and phone number, if it's posted to ask questions regarding its business before you buy anything.
3. If you want to buy books online, you'll get a better deal if you get them used. Dependant upon the condition you get them in, you may just end up paying a few cents plus shipping. Make sure you go through the description of the book to see if you can find any damages you should be aware of.
4. Learn more about the payment methods offered by the online store you are interested in. Most stores provide you with the option to pay with a charge card or with PayPal. Credit cards is a safe option only if the store features a secure server. If you do not see any information regarding safety, it is advisable to go through a different store.
5. Sign up for the website's newsletter if they have one. Many times stores will give you a price reduction or some kind of deal when you sign up for their newsletter. Find out if there is a deal associated with registering for the newsletter at any store you would like to shop at.