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There is an e(vil)bay auction (not mine) that is ending soon that has two Carl Zeiss Jena P6 lenses and a P6-645 adapter at almost untouched prices.
eBay Canada Seller: vkk2000: Cameras Photo on eBay.ca at low prices
I have the CZJ 50mm he is selling, and it is
*incredible* for that price and FOV. No idea about the 120mm.
**NB: the seller also had a bunch of other CZJ and 645 stuff with active bidding that he "ended early" so don't expect to snipe these. In fact, I'd bet you could contact directly (in the next 4 hours) and come away with all three for not much more than the current bids combined...
-Mark
(BTW, I was watching his CZJ 180mm 2.8 Sonnar, and it was one of the items "no longer listed" despite many bids above market price)