Whats the cheaper of the bunch?
I sound like my father lol.
the 3V unprotected types like the ones posted by Crash are gonna be cheaper, since you can get them pretty easily
around 4$ for the protected type is the cheapest i found
i really dont see the point of buying the unprotected 16340s though
unlike the CR2s you can get a PCB with them so buying them without
doesnt make sense to me