贵的那个有时会减价$20, Bags combo page有时会减价$8
http://www.costco.com/CatalogSearch?storeId=10301&catalogId=10701&langId=-1&refine=&keyword=food+saver
http://www.costco.com/CatalogSearch?storeId=10301&catalogId=10701&langId=-1&refine=&keyword=food+saver