Does anyone know of any online booking websites, other than flybmi.com, which give the class code before purchasing tickets?

I stumbled across one a few months ago but stupidly I've lost the URL. Expedia and Travelocity will not give the codes - even in you phone them!

I'm a diamond club silver member but use Lufthansa more than I use bmi, so it would be very useful to get this info when booking.

Thanks.