I don't have much time in these days, but at first sight I see you asked for games made by Epic Megagames.
They are often sold at "EpicClassics", this time we are lucky, it seems that only "Solar Winds" is sold there.
EpicClassics.
And another thing, isn't your "Beareau 13" this one on site?
http://www.abandonia.com/en/games/416/Bureau+13.html
Sorry, I'll check the other titles soon, now I'm a bit busy
P.S. in the meantime anyone can check if a game is still sold around the net, especially at
Amazon and
CDAccess.