For some of my NVA kit, I used www.royaltigergear.com
The prices were fair, shipping was prompt considering it was from Asia.
You make your order, and then they email you a quote with shipping options, and then you reply to complete the order.
I got my "elephant trunk" and canteen from there. My canteen cap is bakelite! Beautiful. Seemed absolutely new. Where as on ebay they go for much more money and look totally abused.
Look in the real surplus/china PLA section for many items for your NVA impression. Vests, bandages, elephant trunks, canteens, grenade/drum/mag pouches.
They also have some interesting items that are most probably repros. But neat in my opinion, like Afghan/Northern Alliance Lizard pattern uniforms, PLA camo from 80s, 90s and today. WWII repro gear. Contemporary Japanese camo, I've never seen that for sale anywhere else, repro or real. As well as all the other typical modern kit you'd find on any other site.