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Don't know if anyone is searching for a Pentax A 200mm f4 Macro lens but there is one on ebay for $1,599. The listing organization is a charity. It looks to be in decent shape but it has not been tested.
RARE SMC Pentax A Macro 1 4 200mm F4 Lens | eBay
Seller also has a Pentax A 600mm f5.6 for sale on ebay for $1.899 with both Pentax Rear Converter-A 2X-L (51473)
Pentax Rear Converter-A 1.4X-L (54645)
http://www.ebay.com/itm/Pentax-SMC-PENTAX-A-600mm-f-5-6-ED-IF-Lens-2-Rear-Co...4AAOSwMtxXvDoc