Need some wicked-looking ordinance to complete a WW1 or WW2 display?
Inert Products is the place to go. Normally their forte is modern-day military training aids, but they have a section that has WW1 and WW2 -era grenades and shells. They have a selection of German stick grenades, US fragmentation grenades, and even a mock-up of a "sticky" bomb.
Site is worth a peek or two.