Patagonia Ladies' Rain Jacket Gore-Tex at D.C. Costco B&M $50
As with any Costco brick and mortar deal, this could be very region specific.
I was at the District of Columbia Costco last night and saw Patagonia Ladies Gore-tex Super Cell Jackets for $49.97. I would estimate that there was about 20 jackets left, and they only had the blue and purple colors.
I've attached a picture that I took approximately a month ago when they were selling for $150. The blue color was available last night in all sizes.
The model at Costco is probably similar to this one selling for $250: