Thumb Score: +47 Deal Editor Note: There is no way to verify stock/price but since this deal is performing very well with the community and members are reporting success, we have decided to promote this deal as a Heads up to those who would like to check In-Stores for stock. Select Costco Stores has for Members (link for reference): SUN+BLK Kinsley Total Blackout Window Curtains on sale for $16.99.