I just needed the Vinturi Wine Aerator, as the wine I just had needed to breathe badly, but I did not want to poor the whole bottle in a decanter. With the Vinture Wine Aerator you can poor yourself a perfectly aerated single glass of wine.
The Vinturi Wine Aerator sells for on Amazon.com for $39.99.
Usually I drink a whole bottle of course, in that case I just need a decanter.
See also the Vinturi site.