I looked for the same thing for months.
This is the best looking safe for a nightstand.
www.personakey.com . I didn't purchase this safe because I couldn't find any reliable reviews on it, and because I couldn't determine if it could be securely fastened down. But it was the most appealing of all.
(edited to add picture)
I ended up purchasing the Smith&Wesson "VersaVault", and mounted it on a bathroom wall (close to the bed). From what I've gathered, the Mini Gun Vault is the same quality (or possibly better than) the versavault, although I like the versavault.
(edited again to add versavault picture, available at
dillon precision)
I believe the versavault and the gun vault are a little too big to comfortably mount to a night stand if you are concerned with astetics.
Your probably stuck with looking at the versavault, gun vault, or personakey safes.
The "gunvault" is shown below.
Good luck,