I think they cost me about £140 +VAT. Sorry for the inaccuracy but I purchase four items together!
Here are some details if your interested....
They are made my Crystal, and have a part no. of N-4311. They fit both the R33 and the 180SX. They come in a dark green box and have a price of 18,000 yen printed on the box.
I hope this helps at all!
I'm back at Abbey on Tuesday (It's only 5 mins down the road) so I'll find out if they can order any more!