I have been looking out for some as well, but can not see any on there in the last 2 months which have been lss than £100... usually the auctions go upwards of £150...
No worries guys - there are always pairs coming up for sale on the 'Bay so if you don't get a good price, wait for another to come round.
My rating is >255 on there now, so you can tell how much i've used it over the last 6 years. In early days it was for guitar strings (in bulk) and other items that are over-priced in shops, then WW2 RAF pilot gear and now just bits and pieces I need to fly (that dont have an expiry date).