Hello. It's my understanding that the small number of FN Hi Powers being imported are in 9mm and that the forty is currently not being produced. The .40 HPs can still be found, but fewer and fewer are still "out there" as time goes by with none being made.
There is a .40 Cal. BHP Hi-Power Practical,with adjustable sights, at the Scheels store in Bismarck, ND. I last saw it 10 days ago, when I bought a 9mm BHP Practical with fixed sights. The asking price is $525.00, it is NIB. at that price you are really getting a great deal.