A friend of mine in alaska bought a vac master svp-5 and I believe it around 500 dollars. It is on the low end of the commercial vac packers. We put a cup in a bag and the bag almost completely coated the inside of it from the suction.Take a look http://www.profmarket.com/
Also I have a food saver and when I package anything with moisture I put a rolled up piece of paper towel at the top to catch the liquid, the air goes right through and I get a good seal.