I'm with Dennis on this one - also quite curious about the origin of micro-sized atomizer bottles...
I have plenty of tiny droppers for repackaging (thanks Lawson!), but a tiny atomizer would be very useful for the non-DEET bug spray I use. (I'd use permethrin but have cats in the house, and DEET would melt most of my clothes...)
Edit: Thanks Bob. Okay, so I'll check my local Japanese supermarket. Lucky, there is one near me in the 'burbs - Mitsuwa Marketplace. Also, if you ever find yourself at Mitsuwa, Santouka in the food court has the best ramen in the world (I recommend the spicy miso w/ special pork).