How about a BIG box of .25 Stevens ammo?
There are still a lot of Cooey Canucks out there, not to mention Stevens and other rifles.... and there hasn't been a single cartridge since 1968 (at which time I had 500 on order but the new guys decided to trash it instead of sell it).
Bring out the cartridge, along with a semi-autorifle to handle it. Any .22 Mag-length action can handle it, just put in a roller and spring to provide some locking.... and have a go.
Should sell like hotcakes, too: a really FUN cartridge with some wallop.
And then the Lugers...... 106mm P-08 and a .40 S&W with a medium-weight 5-inch tube. And a whole bunch of 106mm barrels.
.