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$ 100 off from the original price at $ 249. It seems this deal will be there for a while based on uniquephoto.

B&H:
https://www.bhphotovideo.com/c/product/1234034-REG/sigma_89e965_mc_11_mount_adapter_for.html [bhphotovideo.com]
Adorama:
https://www.adorama.com/sgmc11c.html
Bestbuy: