Wow. Announced about a year ago at a price of over $400, the Ultimate Ears TripleFi 10 and TripleFi 10vi “Noise Isolating Earphones” are going for just $99.99 each on Amazon today, down from yesterday’s (and presumably tomorrow’s) price of $328.

The TripleFi 10 set features just the earphones while the 10vi set adds a microphone for use with your cell phone. Billed as “The Choice of 75% of the World’s Top Touring Musicians,” the earphones sport 26db noise isolation and a “Triple Armature Speaker.”

The deal is good today only.

Ultimate Ears TripleFi 10 Earphones [Amazon.com]