Off hand I don't know, I think they're bob on Â£30. They're really good though, I had a set on my old 45cm and now use the intake on my 60cm. It's your choice at the end of the day though. If it was up to me I'd buy a hydor eth200 rather than the glassware though.
Ordered my filter(ttex600) from zooplus today, and not only was it the cheapest price @ Â£54.90 online, but they knocked off a welcome coupon worth around Â£5 so for Â£50 inc. delivery so far i cant fault them, cant wait to get it now and get it cycled so i can setup my tank