Contact customer service - many times by chatting with a customer service representative they will give you extra discounts to complete your purchase.
Request price drop refund - some companies will give you a refund for the difference in price if the product you purchased drops in price.
Free Shipping - always look for free shipping coupon codes or for the minimum free shipping amounts to score this discount.
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.
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.