Apparently, nowadays there is no excuse not to have a vibrator. At home, in your car, in the office, in your purse, in your mobile phone, connected to your player, everywhere. If you do not have a place to hide it, or you do not want it to be seen accidentally, a vibrator can be built-in virtually anything.

For example, in a shaver (a shaver is supposed to emit specific noise, so nobody at home will notice anything, when you are playing in the bathroom), or in a pen (found this vibrator on eBay, in this eBay shop, selling computer parts)