I finally found "Death smiled at Murder" (Italian Shock) for a normal price from a guy selling 2nd hand DVDs online in Belgium.
And also got the Death Wish 5 dutch DVD from him, which is a 4:3 edition (the 1-4 Dutch death wish DVD's I have are all widescreen).
"Death smiled..." has the same aspect ratio, unfortunately. There's a new one just out on Cinekult (Italy), which should be widescreen, but only has italian audio and subtitles.