Yup, there still about, I see 'em in local hardware stores from time to time.
There's also a steel cased battery with four of them for 6 Volts with a strap handle on the top.
Number 6 cells, sometimes called igniter cells as they were used to light oil burners (and still are in a few older houses around here). Likewise, my grandmother's house used a pair for the doorbell. Come to think of it, that's where I found two pennies in her fuse box when the scout book suggested young scouts check for them for safety reasons. Dad took me down to get to real fuses to replace them with, although it took some doing to figure out how to get the pennies out (finally used a wooden match). Long time back...
I used to tear them apart as a kid and get the fat carbon rod that ran down the center.
Doug Owen