I gave up on the FoodSaver brand itself. First unit lasted 3 or 4 years, 2nd one lasted less than 2, and customer service was less than worthless. Much happier with my Vacmaster.
As far as bag material.... I bought from Webstaurantstore.com (link acquired here, I really need to either shake someone's hand, or kick them in the shins... that's a dangerous site.) I've been pretty happy with what I've gotten for my last order.