On one of mt favourite hobby-horses I'm afraid!
I see this in shop windows (one carefully painted one about 2 miles from my house), on posters and worst of all offered for sale here, in eBid!! (Go on! Do a search!!!)
May I point out to the guilty parties that items will NOT be sold if thay are declared to be "stationary"!! Getting them to the post will be very difficult....
I know most here will wince at this; however, if you do not know what I am on about, please check a dictionary!!
Over the years I have been to many a stationEr's, but I have never ever come across a stationAr's. Strange innit?
I'm waiting for somebody to have for sale a "stationery engine"!!!