Big D - at this moment an eBay search for Parker Coffee Grinder returned 19 active auctions - 3 of them the sort on a board with a small tin hopper and lid which I guess you are talking about. There is quite a variety just of this type, some the brass labels, some without, take your pick. The Christmas after the Parker bug infected me, my best buddy's family gave me one, I believe they paid $65 for it. The ones now on eBay range around $50 +/-
Take a look at:
http://www.oldcoffeegrinders.com/