I was at my local Lowe's yesterday and saw they had the Gladiator GearTrack
Channels on sale buy one get one free. The website shows it as $6.27 each (
same price basically)
Gladiator 48" GearTrack Channel: http://www.lowes.com/pd_182183-46-GAWC041PRY_0__?ipTrail=173.18