Yeah I've tried Ebay, but they see to be going for about £400+ when you can get a new one for about £550... Will keep my eye on one but I never seem to be in when they are finishing either!
www.Adtrader.co.uk or sometimes www.equineadvertiser.co.uk or horsemart.co.uk - check them regularly and kepp your fingers crossed but have seen a couple come up on equine advertiser - good luck!