I usually let my meads or wines sit for a year to naturally degass. This can really tie up a carboy and recently I looked into different ways to degass my meads and wines. Vacuum sealers are fairly expensive but there are some which are handheld that are cheaper. I finally found one which I got on sale for $5.47, retail is $11.00
Pictured is the reynolds wrap vacuum seal hand held model, again it only costs a few dollars. It does a really good job, and allows mead or wines to be in and out of a carboy in a matter of months instead of years. I really like it and am impressed with its ability to do the job for so cheap.
And in action on a 2 month old mead, which has already cleared.
Degassing is necessary, whether time does it or you use a handheld. This thing will keep your still meads and wines from going sparkling like many of mine have.