What to look for: The most common brand is Food Saver. It is by far the most readily available but not the only available. It is available in most 'box market's' and is easy to find supplies. Other brands include Rival, Deni, Seal-A-Meal, and Weston. The only ones of those I have personally seen in most 'box market's' is Seal-A-Meal. I use Food Saver myself. Mine does have the attachment for the 'jar sealer' that allows me to seal mason jars.
Here are some examples:
This is a vertical standing Food Saver
This is a standard Food Saver that sits flat on the counter top.
These are canisters you can get to vacuum seal with the Food Saver
Hose attachment to vacuum seal jars & canisters
Rolls to make 'bags' for food saver
Attachments to seal Jars: Wide Mouth Regular Mouth
If you decide to get a vacuum sealer, I would highly recommend getting one that seals the mason jars/canisters as well as the bags and being able to make your own bags. I seal mason jars of all sizes with things such as flour, clear jel, xantham gum (expensive stuff!), beans, dried peppers, herbs, bulk spices, and even lettuce!! Yep, I vacuum seal lettuce to keep fresh in the refrigerator for up to 2 weeks (that will be a different post!!)!! I use the bags to seal vegetables and meats for the freezer as well. We often buy in bulk packages and this saves us money. If I can't get to canning vegetables or fruits right away, this saves them from going bad too quickly.
Jar with vacuum sealer and hose attached