You already know about all the secret perks that come with a Prime membership, but some of these lesser-known shopping tips can help save more money (and you don't even need Prime!). 
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1. You Can Trade In Unwanted Items for Cash.

Amazon accepts a long list of electronics (tablets, phones, cameras, video games, and more), as well books and textbooks in exchange for a gift card. Items must be in acceptable condition and shipping is included.

2. They Price Match TVs.

Within 30 days of purchasing a television, the retailer will match a lower price advertised on Amazon or at another qualifying retailer. The refund, which takes any differences in shipping or promotions into account, will be given in the form of an gift card.

3. You Can Score a Great Deal on Open-Box Products.

Like floor models in a traditional store, Amazon Warehouse offers TVs and other electronics, as well as home goods that have been opened, damaged, used, or refurbished, at deep discounts. Items are listed by quality (very good, acceptable, or like new) and are backed by Amazon's return policy to ensure buyers know what they're getting.

4. They Have an Outlet, Too.

You can shop for items on sale in virtually every category (clothing, jewelry, electronics, and more) by using Amazon Outlet. Here, you'll find markdowns, clearance items, and overstocks up to 80 percent off.

5. You Can Rent Textbooks.

Save up to 80 percent on study materials when you borrow instead of buy. All textbooks arrive in acceptable condition, with minimal writing and highlighting.

6. Students Can Save In Other Ways, Too.

As a student, you're eligible for a six-month free trial of Amazon Prime. Once the six months are up, you can get Prime for $49 (50 percent off the standard membership price) for up to four years. Students are also eligible for exclusive deals and discounts.

7. Parents Also Get Special Perks.

Amazon Family offers special discounts and coupons on select household goods, age-based product recommendations, 20 percent off diaper subscriptions, and 15 percent off remaining baby registry items.

8. You Can Set Up (and Save on) Recurring Deliveries.

Save up to 15 percent by "subscribing" to thousands of items—toilet paper, coffee pods, laundry detergent, and more. Simply select the quantity, the delivery frequency, and start date.

9. You Can Share Your Prime Benefits.

Two adults living in the same household (that includes roommates!) can share select prime benefits, like free shipping, free video streaming, photo storage, early access to sales, and more. Simply add an adult in Amazon Household.

10. Shopping for Gifts Is Easier.

In addition to baby and wedding registries, Amazon also provides gift suggestions by recipient (adults, kids, toddlers, and babies) and then narrows it down even further by offering filters (anytime gifts, beauty, pretend play, books, and more). Users can also create searchable wish lists.

11. Readers Have an Entire Library at Their Fingertips.

For $10 per month, Kindle users (device or app) can choose from more than one million books and thousands of audiobooks. Bonus: The first month is free. Don't want the monthly subscription? Each day, Kindle Daily Deals offers a number of new books at discounted prices.

12. You Can Shop With Points.

Have a credit card that accumulates rewards points? You can use those points to pay for goods on Amazon. Simply use that card and indicate how many points you want to apply towards your purchase during checkout.

13. You Can Save on Apps and Games.

Amazon has its own digital currency called Amazon Coins. You can buy those coins (100 coins for $1), and then use them to pay for apps, games, and in-app purchases at a discount of up to 25 percent off.

14. Amazon Makes Good on Missed Delivery Dates.

If an item qualified for free shipping through Amazon Prime and was not delivered on time, you may be eligible for a one-month extension on your membership. Shipping costs will be refunded to those without Prime.