Walmart offers the Sto-Away Yard Tool Corner Storage Rack, model no. 82-YJ476, for $16.13. Opt for in-store pickup to dodge the $5.97 shipping charge. That's the lowest total price we could find by $9, outside of the mention below. The rack features 18 storage slots.
A close price: Home Depot has it for $16.62 with free in-store pickup.