I use this one from Costco
http://www.amazon.com/FoodSaver-Adva...p_ob_k_title_2.
I believe that they go on sale from time to time, a supply of replacement bags (8 Rolls) is about $40. But they last quite some time. I freeze Soup, Chilli, Meat, Fruit, Baby food, you name it. It really is the one kitchen gadget that you wouldn't think gets used.. but does quite a bit.