Wheres the best place to buy online? I've looked on Amazon and don't see anything that says 4 mm which I understand is the minimum you want to use. I've been using FoodSaver bags and want to improve on them if possible. I also intend to buy a better vacuum packer in the Spring (either a Weston or VacMaster). I've found a few on Amazon which seem like a pretty good improvement over my FoodSaver in the $550 range. I just don't see the FoodSaver being able to deal with the quality of sealing I need. Anybody buy on Amazon? If so which bags? I don't want to buy 1000 ft. Just enough for the season.