I bought a Foodsaver 3825 off Craigslist unopened for $100. I would not pay retail for it, but at that price it's a worthwhile investment. The cheapest I could find rolls (generic) was about $.35/foot for 11" rolls. You just have to scour Amazon and eBay and do the math to find the current best deal. My generics work just fine.
My biggest complain about Foodsavers is that they steal ~2" from your bag every time you cut and reseal it. Hence, it's best for one-time storage and not for frequent reopenings or reusing.
I do use the marinating canister very often and I want to get the mason jar sealer for sauces and such.