I've had mine for a while, but hopefully still available. Made by Berkshire Junction, their "E Z Line". For phone, electric and wire fencing. It did come in several colors. Got mine from a TrainBoard advertiser, Fifer Hobby. Try checking with them.
went to walmart and got some stretchy thread , got it in a silver color to replicate barb wire... think it was 1.50 or so, for HO