I’ve never seen a smoke alarm for sale in any of the home centers I’ve been to, so I finally “got around to it” and imported a box of six of these Kidde combination smoke/fire alarms. Mine are already in place, and I’m going install 3 of them at my mother-in-law’s house. I figured I was going to get a customs hassle of some kind, but no. They have some cheaper ones at The Flying Pig, which I suppose means they have them at Costco for you Tokyoites. I recently heard that Costco opened a branch in Amagasaki (between Osaka and Kobe).