Your pics are both reprints. The originals, from 1902 and 1903 respectively, are rarely seen and very pricey. Reprints of both can be had on Fleabay for prices ranging from $25 to $100. They can slip by kinda' under the radar which accounts for the low prices at times(I got a Last Cartridge for $23, including shipping, in 2007). Don't show up often but they are available.
The original "Hostiles" and the 80's reprint have a twig in the left foreground. The shoreline under the horse in the original is straighter than the reprint. There is a 1950's reprint that has the S&W logo instead of the twig and a different shoreline under the horse. It seems there was another reprint with the logo not that long ago but am not sure(CRS ya' know
). The original "The Last Cartridge" has a dead cub in the lefty foreground while the reprint does not. Not PC to show killing animals ya' know.
Hopefully this will be helpful in telling you what you are looking at when you do see some. You may be that lucky dude who stumbles on a seller with an original and thinks he has a reprint.
Bob