I wanted a toy... Ideas and links?

OK. I admit it, I'm bad, my mind is on sex and I'm not always appropriate. (sort of...)

I was sitting at my desk and trying to work. I wanted a toy. Something completely insertable, egglike, but heavy enough and with an interesting shape to actually make a difference. I definitely wasn't thinking of something with wires because discretion was mandatory. I really wasn't thinking of vibration itself- more of the joy of a fist! But who knows...

The smart balls wouldn't work here because by themselves they are really too light to make a difference.

Any ideas?

There's a set of glass eggs in the works from Xhale, but I'm not sure when they'll be released. I tested the prototype, and they're definitely heavy (the prototype is 4.8 ounces). They're comfortable enough that I've worn mine all day a few times, but because they're hard and heavy they don't let you forget that they're there, if that makes sense.