Got mine off McMaster, though you'll have to order it in two pieces. First get a 1/4NPT brass 45 degree elbow and then get a brass 1/4NPT 1/2 barb. Costs about 5 dollars for two sets.
Be warned though, those 45 brass elbows KILL flow so absolutly drill it a little wider. As for why they make them so needlessly restrictive, I have no idea, but it takes about 5 min and a drill to fix
