Hi Muck,
I ordered mine through "Premium Aquatics" in the US (
www.premiumaquatics.com) and they were $13.95 US per powerhead + $12.00 US for shipping - UPS 5 days.
Customs and brokerage were $20 CDN, so total for each powerhead came to roughly $35 CDN.
They are available here in Calgary at Oceans butu I believe he charges $45 for the 200g/hr. They come in 100, 200 and 300.