Yep ook van Antwerpen! @Sara, seriously, it isn't hard to find weed in Antwerp
Pretty soon you'll probably meet a dealer. If not: here's an option.
In de "Van Kerckhovenstraat" (look it up maybe, near Central station), you have a lot of dark, dubious bars or "vzw's" where you can walk in and buy pot off some very stoned Marroccans. Not the best weed, but hey, when in Rome...
But of course it's best to take a train and go to Marijuana Disneyland, Holland.
If you don't like Roosendaal, maybe the Kinky Corner or Miami in Bergen-op-Zoom is an option.
Also, just been to Terneuzen, and I must say, coffeeshop Checkpoint is pretty great, and a few yards from there there's another coffeeshop called Miami. Good stuff! (not affiliated with Miami in Bergen-op-Zoom)
Good luck!