The Pentax smc PENTAX-FA 50mm f/1.4 lens is listed as discontinued
The Pentax smc PENTAX-FA 50mm f/1.4 lens is listed as “completed production/limited stock” on the official Rioch Japan website:
The lens is also listed as discontinued at some Japanese camera stores:
In the US the Pentax smc PENTAX-FA 50mm f/1.4 lens ic currently in stock at Adorama, Amazon, and B&H.
More discontinued lenses can be found here. The official list of discontinued Pentax lenses can be found at Ricoh Japan website.