Fjm44.com is a website specialized in World War 2 field gear, helmets and uniforms. The website also has a huge reference database that is worth checking out. One of the most knowledgeable dealers in the hobby that offers top quality.
Dutchmilitaria.com offers a wide variety of items and is specialized in World War 2 civil and political items. A very friendly dealer that offers significant help to newer collectors. He also organizes the Houten militaria fair a few times a year.
Oorlogsspullen.com is respectable dealer that offers a wide variety of items from the World War 2 era. And is specialized in Dutch collaboration items. He also offers a large amount of Russian and German items, and often has something for beginner and advanced collectors.
Generalassaultmilitaria.com is one of the biggest growing dealers of the last few years and specializes in World War 2 German combat awards.
Hj-research.com is a forum specifically made for researching youth related items. It recently became free and is worth checking out.