Or check out Vintage Joe's he has some nice handles for a reasonable price. Golden Nib has new handles for around $20 so I wouldn't pay more than that for a vintage given the extra work that will be involved in cutting out the old knot.
As well as antique shops and the like, I like the look/prices of a few of these
http://www.whippeddog.com/As-Received-Brushes/
Larry's a great guy to deal with and the knots he carries are top notch to bootI'd much rather deal with him than hassle with ebay and more than likely overpay
(disclaimer: I have no affiliation to whipped dog razors other than being a very satisfied customer)
EDIT: great... i found one i couldn't resist...![]()
thanks a lot![]()