Stores and websites that sell hiking and climbing gear
are a good place to start looking for headlamps. However, you may have to hunt around for the red lens versions, which in the past were mostly marketed to the military, but are becoming more popular with us civvy types.
Princeton Tec makes a couple of models that have a red lens option, and are also waterproof. Check out the "Eos Tactical" and "Quad Tactical". I have an older version of the Yukon with a red lens that I had to order the separately. I also have a couple of non red lens Princeton Tec lights and can vouch for their reliability
. Check out the Princeton Tec website at http://www.princetontec.com/