Walmart has the three hook garage storage rail on clearance for $2 each with $5.99 shipping or free store pickup.
You can also scroll down and select the "buy together" option which is buying two of them for $3.20. Hopefully the fulfillment center gets it right.
This isn't Gladiator quality, but it's $2. Other SD posts on this brand say the Gladiator hardware is not compatible.