Check out Ebay. I bought an older model used Foodsaver there for $20. It isn't one of the big fancy models where the bags actually stay in the unit, but works great. Also the bags I buy are a generic brand you can get at Walmart. The Foodsaver brand bags are more expensive, but other bags do work in there.
There are other brands of vacuum sealers that work really well too and I'm not loyal to foodsaver it is just what I bought because I found a great price on ebay.
Freezing leftover BBQ is great. There are so may instances where i want some pulled pork to make ABT's or pulled chicken to make some sandwiches and I don't have time too just simply start cooking an entire butt or whatever.