Northern Tool offers the Ironton Steel Hitch-Mounted 4-Bike Rack, model no. 41157, for $39.99. Opt for in-store pickup where available to avoid the $18.49 shipping charge. That's $40 off list, tied with our October mention, and the lowest price we could find. It converts from a two-bike rack to a four-bike rack and handles up to a 120-lb. load.