Home Depot has 500 foot at under $3/ft. Platt.com has cut lengths for $3.37, probably plus shipping, so maybe if you have a location nearby. Cut lengths of that size are probably going to be expensive as it's not used that often outside full rolls even if you end up with another vendor. Might check a local supply house and see if they can get you less than 500'. Looks like Kraloy/Kwikon makes a 2 inch in Gray for about $1.80/ft in 225 foot coils.
I ordered all my Resi-Gard from Gross Automation, they do direct ship I think, and might be able to get a 50 foot, but shipping is gonna be high.
Edit: Looks like Graybar also has 2" in cut lengths(Part: 12011-CUT REEL) but you'd have to call them for pricing and might be able to pick it up and save on shipping.