Just ordered a new E4c to replace my E2c from Erwin computer.

$178.00.

They are a Yahoo! Shopping affiliate.

Thought about the 5's but decided the 4's would do.

I will order the PTH (push to hear) device directly from Shure. Putting this in-line between the sound source and the earphones lets you push a button to activate a microphone so that you can hear someone speaking to you without removing the earpieces. This has always been a minor annoyance when flying especially with the deep insertion of the Shure earpieces.