The SafeRacks Wall Shelf Combo Kit is on sale at Costco.com for $49.99
The kit includes two 18"x48" Shelves and four deck hooks.
https://www.costco.com/.product.100389
This is part of Costco’s 5 Days of Deals, so this might be on sale for just one day (Wednesday, August 15). I purchased this last time it was on sale (July 16), but I have yet to install it.
Features:
Shelves Provide Total 500 Pounds of Capacity
Install Shelves Side by Side or Separately