eBay is not too bad, a lot of the sellers are actually Aviation shops anyway. I did exactly the same thing as QNH1013.2 and bought my X11s from Gulf Coast Avionics...
http://www.gulf-coast-avionics.com/
...I forget exactly how much (only just bought them too
) but it worked out hundreds cheaper thanks to the current dollar/exchange rate
QNH1013.2 - what's your initial impression of the X11s so far? Tried using them with sunnies?
LP