I recently picked up a vacuum pump at Harbor Freight for about 70.00
It works fine as far as pulling, but whenever I have used it, it puts off an oil mist or smoke that is supposedly normal. I don't like it though. It smells up the basement, and I don't know if any of it would permeate any open wine.
I'm hoping it gets better as I use it more.
If you are new to vacuum pumping, make sure to read up on the forum about how much vaccuum to use. Too much pressure can be a real bad thing for carboys.