Use multiple email addresses - sign up for stores email lists using a couple different email accounts. Stores will offer single use coupon codes, combine these single use coupon codes from multiple email accounts to maximize savings.
Keep patient shopping cart - by not completing your purchase quickly, merchants will reach out to you and offer better pricing or more coupons to encourage you to complete the purchase.
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.
Avoid dynamic pricing traps - clear browsing history and logout of social media accounts to avoid being targeted with higher prices.
Set up discount email - to clean things up, set up an email specifically for collecting coupons and discounts without cluttering your personal email.