The last two sets Ive seen go on Ebay went for £30 and £70 so some variation, Ive known of people pay £100 a pair. One on its own, well your looking for someone whos most likely had a accident, so hard to say....
There is a small split/break in the glass on the passenger side which I circled in one of the pics in the slideshow, its the passenger side one though so....
The break really is nothing it cant be seen once they are on the car and it wont get bigger or anything.
Check ebay to find out what they fetch. This thread is turning into a advert bump so I'm going to close it. If you have parts to sell put it up in the classifieds with a 'best offer' price.