Online Travel Booking and Bidding Agencies - Premium economy search sites??

I have tried ITA as well as Expedia and Travelocity but have not found sites with Premium economy travel seats. Business is there as is economy. I need the extra leg room from p.e. but have to search on individual airline sites. Oh bother...

Any suggestions?

I've only found it on www.expedia.co.uk or www.expedia.co.au or www.zuji.com.

I've never actually bought it because you have to pay in a foreign currency, and wasn't sure about the exchange fee (if any) that would come up on my credit card.

That should be www.expedia.com.au :D