Use reward programs - check out such products as Swagbucks and Shopkick, these companies will give you special discounts and gifts for filling out surveys and shopping around.
Set up discount email - to clean things up, set up an email specifically for collecting coupons and discounts without cluttering your personal email.
Request price drop refund - some companies will give you a refund for the difference in price if the product you purchased drops in price.
Enter multiple coupon codes - combine multiple coupon codes at checkout to score the biggest savings. Also referred to as stackable coupons; combine a sitewide coupon with a free shipping code.
Avoid dynamic pricing traps - clear browsing history and logout of social media accounts to avoid being targeted with higher prices.