I've used the 'foodsaver' brand also for 15+ years. Google foodsaver or tilia and you should find their website.

We've always used the bulk rolls -- 8" & 11.5" width.

The mason jar sealer works well. With a little care when opening, the lid is reusable

I don't know prices but I bought mine at Costco -- which they still stock, along with replacement bags.