Have you tried the divoza copies. They are just as good and a great price. They also do the real thing so you may be able to get one. http://www.divoza.co.uk/subcat57-1296.aspx
or are you looking 2nd hand? I expect you will find it hard to get one 2nd hand as people tend to use them to their death... Mine has been patched up SOOOO many times now! Also even if i sold my mare id give them the boett partly for peace of mind so that i know she shouldnt end up in the state she was before i bought her.