I recently ordered some Moose Antlers, since deer and elk antlers are such a big hit.
For those who haven't tried either, here's the run down.
Deer and Elk Antlers - Super hard (Deer more harder then Elk). But sometimes it's hard to tell apart since they are naturally shed. They tend to last for weeks.
Moose Antlers - They last for an hour or less, they are much softer and have a lot more marrow inside. Something to try if you haven't.