Photon Freedom it goes for 12 but don't pay more than 17. If you need anything brighter than this you might as well get a white light since you will get no benefit from red. Unless you need it for not scaring game at a distance...
This isn't true at all in my experience.
If you can find one used, surefire used to make a red LED version of the L1. These are great! (Sadly, they don't make them anymore.)
The other two red LED choices people have suggested, the Zebralight H501r and the Quark RGB are both reasonable. I have both of these, and use them. (I also have a SF Kroma with red LEDs, an L1, and for that matter an Inova X5 with red LEDs).
Both lights are quite floody. The Quark is larger, and likely has much better runtime. It can output white, red, green, and blue, and depending on what you are doing that can either be an advantage or a disadvantage. (If you are seriously trying to preserve your dark adaptation, accidently turning on the high-level white light is completely unacceptable. If that isn't as important, the white light is really handy, and the blue and green are fun.)
The H501r is an angle light / headlamp. It's really tiny and pocketable. It works great as a headlamp, and the output levels are useful. (I use one in my astronomical observatory all the time.)
The Proton Pro that was mentioned (I have one as well) is OK, but the red light isn't that bright. (This is actually an advantage for the most part, as it's variable). But I find it's WAY too easy to accidently turn on full power white with this light, destroying your dark adapatation for 30-45 minutes. So I find I don't reach for it as often.