If your after new ones then
Demon Tweeks Website will be your best bet, they've got a good selection from different companies, and with them being motorsport specialists they should have them in stock
if you spend over £85 on their site they'll do you free delivery too, so you dont even have to go and pick them up if you dont want too
If its a second hand set your after then keep your eyes peeled on the for sale forums of this and other sites, might be worth looking on all the honda, vauxhall, ford forums, with harnesses being universal you might be able to get a set from one of them sites sooner
Hope that helps
