There used to be a HP vibrating broomstick that really was sold as a kid's toy - until the parents figured out what it was (I'm pretty sure it was because older sister kept borrowing it and locking her bedroom door).

C and I were in the local pagan shop and he found a quartz wand that looked exactly like my Crystal Lover dildo. This, of course, had me laughing, mainly because wands are a masculine tool in earth magic, so it'd make sense that they could look like or double as dildos.

I wouldn't know where to look for vibrating wooden ones, but I'm sure hollowing out the handle for a bullet wouldn't been all that difficult if you have the tools.