It's a great headset, had mine for 8 years. Retails for about $330, I saw them on special for $280 last month. It even has a push to talk button on the headset, great for instructing.
AC-900 features: a full flex boom mic and stereo/mono switch on the lead; It too comes with a Deluxe Comfort Package; and also Gel ear seals.
Try
http://www.conceptaviation.com.au/shopmastery_pop.php?cat1=PILOTS&cat2=Headsets&cat3=Avcomm&na me=Avcomm+AC-900+Headset