I recommend the Reynolds Handi-Vac.
It an inexpensive way to get started.
It seals pretty well (not as well as a foodsaver style). After several weeks in the freezer the seal can leak. Therefore, if I'm freezing something valuable for more than a week or so, I seal the meat in a bag, then seal that bag in another bag. Since the second bag has not touched the meat, you can re-use it.
Using the 2 bag method I've never had freezer burn or the dreaded ice crystals on my frozen meat (even after 3 months).
When freezing rigid meat like ribs, you have to arrange them in the bag properly so the air can all get squeezed out.
Be sure to have plenty of AA batteries on hand since there is no power cord.