I compare buying certain flashlight consumables with putting money into infrastructure work. There's nothing glamorous about bridge retrofitting or strengthening earthenwork levees, but at a certain point, it just needs to be done. I ordered some more Streamlight Strion and Stinger bulbs for my SF A2 lights with FM bulb adapters, and some SL TL-3 bulbs for some other FM bulb adapters. I use these lights moderately enough that I'm probably set. Since they don't make these bulbs anymore, the availability is never going to get better, and I decided it was time. Doing enough web-based searching can still find some reasonably priced sources, although some online retailers are charging twice as much (or more!) then what I got mine for.