So I thought my old R.O.P. was dead but it turns out it's just one of the C cells. I tried finding them but didn't have much luck. I was able to get the light to work by making a quick adapter (wrapping a folded piece of paper around two 18500 cells) and low and behold it came to life!
I was thinking of putting it on Ebay but they don't even have a category for it that I can see and even if I find an appropriate category, I doubt anyone would "get it." I bundled it with a brand new 21700 I can't use (because I bought it before I knew the Fenix C7 drew around 9 amps and it's only good for 5), the two C cells (one good, one I'm not sure) and an extra 18500. I put it up on a competing site that allows classifieds but it seems the whole world has moved on to LEDs. I'll never use it and it's too nice and cool to throw away. Too complicated to give away. Ugh, sometimes I hate when things change!