These are really good company's and are the best to buy from.

http://www.airsplat.com/

http://www.kapowwe.com/

http://www.airsoftgi.com/

Airsplat sells some cheap guns although its hard to find Vn guns there.

Kapowwe sells some outstanding guns and has a neat selection in the classic army section i believe

Airsoftgi has VN type guns and is a really good company. Most of the Vn guns are sold out though