Saw Hacksaw Ridge 4K Ultra HD Blu-ray for $15 at my local Target (San Mateo, CA).
(I also used my 20% Cyber Monday coupon to bring it down to $12)
As always, Target in-store price is YMMV. Please check your local Target.
You can check inventory in Target store close to you at brickseek, I confirmed that from brickseek that all Target stores around me are selling this 4k Bluray at $15: