I'm looking for compressed air, one you use to blow out dust inside electronics. I've checked out the big electronic stores, ie Fortress and small computer shops in Tseun Wan and can't find any. Thanks.
You can also try stationery shops and computer accessories stores. The online stationery place Bigboxx sells this one for $97 a can (a hundred bucks for air?!?!).
Try the camera stores dotted around Wellington/Stanley Streets in Central. Also, some of the small stores that sell all manner of electronic gunk (AV cables, LED lights, tv switches, screwdrivers).