While Amazon's Price Protection Policy isn't spelled out on their website, they will refund you the difference if the price of an item that you have purchased drops within 7 days of receiving the item. If this happens, you will have to contact Amazon's Customer Service department for the refund. Be advised that Amazon's Price Protection Policy is only valid on items sold and shipped through Amazon and does not apply to third party sellers.
Amazon rarely offers site-wide coupon codes, but they do offer coupons for specific products. During Black Friday and Cyber Monday sales, Amazon will automatically apply discounts when you add products to your cart. While there might not be lots of Amazon promo codes, they do offer peace of mind when shopping. For example, if you buy an item from Amazon, then spot an identical product on an Amazon competitor's site at a lower price, they'll refund you the price difference. As long as you see the identical cheaper product within 14 days, you should be covered. Review the Amazon price matching policy to learn more.
