Aah, the old faucet... I used to use that a lot when I was a kid.
You can just use your fingers you know...
Also, there are vibrating razors for women o.O They're meant for your legs, but who knows, they may have enough power to use as a vibrator (without a razor attached!). Next, there are vibrating back massagers
There's a lot of ways to find vibrating objects! Oh, nintendo 64 controllers...