Manufacturers
Eureka PuzzlesThe belgian company that produces far most of the entangled puzzles, wire puzzles and string puzzles. Their collection is enormous and ranges from fairly easy to exceedingly difficult.
Hanayama Toys, Japan The creators of the Cast series. Careful: almost completely in Japanese!
Thinkfun makes many of the puzzles in the sequential movement puzzles.
Sellers
Sometimes I have quite a hard time finding a nice new puzzle. The chances of walking into some random shop and finding something are almost zero. Therefore I compiled a list of shops here with a big collection, for those of you who are in desperate need of a new one (or of a present for me ofcourse ;-))
Arabesk online and a shop in Rotterdam
The Joker, game related shops in Utrecht, Amsterdam, Delft and Amersfoort (including e.g. NeverNeverLand in Utrecht)
De Vliegershop in Leiden
Het Spellenhuis sells online and in shops in The Hague and Haarlem
Restylers, an online shop
Pientere Puzzels has a wide variety of puzzles available. See also their links page!