I have the Kenmore Ultra vaccuum sealer that has an extended sealing time feature as well as on-board storage for a roll and a built-in cutter. So far I've been very pleased with it. Sale price was$99 right before Thanksgiving. I've used both Foodsaver and Kenmore bags. I've found that I can even vaccuum and re-seal some commercial bags such as a bag of Pepperidge Farm bread crumbs that I got at Thanksgiving and only partially used. Figured "why not", and it worked great. I used it on a partially used bag of marshmallows, too. That one was fun - made a marshmallow brick out of the original bag. I opened it up, and they "grew" back to normal size. I re-sealed it; it's been almost 2 months, and the seal is still holding. /infopop/emoticons/icon_biggrin.gif I'm sure that not ALL commercial plastic bags will work, but so far the ones I've tried it on have worked pretty well.
Right before Christmas, Amazon.com ran a special on their FoodSaver rolls for... oh, I don't remember now... half price, maybe, or possibly less. Anyway, I bought four rolls, and will be checking occasionally to see when they go on sale again.
Keri C