It's worthwhile if you're buying a pricey home item to check if BBB sells the same item online. Online they don't take the 20% coupon, but you can go to the store to help you place the online order and receive the 20% off (expired coupon is ok too!).
I purchased the Wine Enthusiast branded fridge "online" at the store ( same retail price found anywhere else) with the 20% off plus free shipping promo going on currently... noone can touch the price.