sometimes if you do watch ebay and pay attention, sometimes can find awesome deals. I found a red and creme ever ready in very good shape for $5. Only because they titled it wrong.
I guess you want a brush handle in order to re-knot it...In my opinion don't look for any vintage, overpriced "garbage", just get a brand new Vulfix 404 mix which costs £10.80 -10% discount and if you ordered from Ex European Countries is also - 20% the VAT. Shipping is also very inexpensive. You can find her in diamondedgeltd.com
There are also a lot on ebay. But I have yet to find an antique store without one (OK a couple of tiny stores, but then I went into a couple of other tiny stores and they had many).