I went a relatively small-but-cheap route which cost more than I intended.  I picked up a medium sized vacuum dessicator for around $80 (http://www.2spi.com/catalog/supp/desi3.shtml), a vacuum pump off of eBay for around $100, a vacuum gauge for about $20, and various tubing and fittings.  Probably $200-250 all told.

In retrospect, I could have gotten out for a good deal cheaper, I think ... but what I have works for degassing rubbers safely enough.  The pump and the chamber are really the expensive parts, though there are cheaper alternatives on both.  Check around the forums here, I know there are some stickied posts on better degassing rigs done on the cheap.