I have the Piney Mountain red and green tracer ammo...it was expensive at $20-25 a box, but man it is cool as hell to shoot at night time. It looks like a scene from Star Wars when you shoot alternating colors.
So a 500 round brick of the red tracer .22lr ammo became available at www.unammo.com for anyone wanting some. I think there is only like 4 bricks left. DocHorton thanks for proving those links! Much appreciated.