We've had this gadget since Christmas, and honestly, I never thought we would use it. Saturday night, we had enough Champagne that we actually had leftovers! And two days later, the Piper was a little pooped out, but WAY better than I expected.
The Metrokane Wine Stopper has to be one of the best $7 gizmos ever. You pop it on and screw down the top section. If you do it early enough into the night, and while there is about a half-bottle left, it actually does the trick.
You can buy one on their website. This was a better stocking stuffer than I imagined!