I know one shop in Brussels where they do sell the Mag (I too had to search a lot to find a selling point): it's the WH Smith (aka the former English Bookshop)in the Adolf Maxlaan. They have something like five copies... so leave one for me when you get there !
when I was in Antwerp I found the WM at I.M.S., Melkmarkt 17. You should call upfront before going there, 03 233 16 68, they had about 4 issues left on June 1st. As far as I know, they are open on Sundays as well.
[This message has been edited by Rudy (edited 10 June 2003).]