The Butterfly Price Guarantee assures you that products purchased from Butterflyonline.com will not cost you less if purchased from any other North American or European online retailer that lists their prices in U.S. Currency. If you find a regularly priced product from North American or European online retailer, with prices in U.S. Currency, to be cheaper prior to your purchase, we will not only match their price, but also take an additional 10% off the difference in price.  This offer excludes "membership required" sites.