SURPRISE: Save 30% on Fujinon GF50mm f/3.5
At the time of this post, AmazonUS here and BHphoto here are offering the Fujinon GF50mm f/3.5 with a 30% rebate.
At BHphoto here, you also get a free UV filter on top of it.
This is not an official deal, so no idea how long it will remain available.
I own this lens and it makes the perfect everyday walkaround lens for the GFX100S, making your 100MP medium format system ridiculously compact and light. When I am out with my family and decide to take the GFX100S, then this is the lens I glue on it.