Texas Tactical Supply has them for $11.99 The green is not quite as bright as the Ultra. But it's in the ballpark. Much easier on the eyes at night after you've been asleep for a while. The Ultra's beam is wider and smoother, there are a few rings in the green one's beam. I use my Ultra for around the house in the evening because it's white light is superior for most things that come up when there's already some ambient light. The green Infinity is my nighttime light. Up to the bathroom, etc. It's less harsh on the eyes. It's hard to say which one I'd pick if I could only have one. I'm now looking at maybe even getting a red one and a blue one to add to the set. I aready have a blue/green one too. Very similar to the green. Maybe the blue/green is a microscopic tad brighter than the green, but mine has slightly more pronounced rings. For me it's really a toss up between the green and blue/green. Since the green was my first, it kindof holds a special place in my heart. I don't have the original Infinity in white or amber so I can't comment on those. I'm not sure if they even still make the amber. For $11.99, don't agonize over it too much. Just buy one or more. I like nice sturdy well made things. All the Infinitys definitely qualify.