I enquired at Watford audi a few months ago and they were £35 ish as I remember. That was for two fronts only. Had to be ordered in too.
I had just bought my B5 and it had new dark blue ones in it so was going to swap to black, but for £35 I decided to grow to like the blue ones. And now I do, match the stripes in the sport seats and brighten up the very black interior.