This maybe? I retains the TTL functionality:
http://www.jessops.com/online.store/products/67558/show.html
I used to have a cheap Jessops bounce auto flash, it was plastic but it did what it said on the box. The only thing I'd be wary of is making sure the TTL works with digital bodies. I don't know on the Nikon system, it may very well be fine, but with Pentax I have to have a PTTL gun for my digital bodies and most of the cheap ones don't support it. With Nikon being a more common make they may well support the required protocol, but worth making sure before you splash out. Take the camera into a Jessops and see if they'll let you play (they should)