Don't know how I initially missed this statement from Dahua (2012).
1. Dahua Technology only sells wholesale products through authorized distributors to ensure that customers obtain proper support and service, and Dahua Technology has never sold Dahua Brand Products on any e-commerce websites.
2. If a Dahua Technology product is purchased from an unauthorized distributor, websites or other sources, it will not be honored or serviced under existing Dahua Technology warranty policy. Any sale of products by an unauthorized source or other manner not authorized by Dahua Technology will void the warranty on the applicable product.
3. Dahua Technology reserves the rights to lodge a claim against those who infringe Dahua Technology’s legal rights.
4. If you have questions about a reseller or spot that Dahua Brand Products sold on e-commerce websites, please contact Dahua Technology @overseas@dahutech.com.
5. Here is to public a name list on the websites of unauthorized sellers of Dahua Technology. Any Dahua Technology Product purchased from these online merchants will void the applicable warranty.
www.aliexpress.com www.ebay.com
Kind of a short list though, and no Amazon.
Here's Hikvision list, for instance:
Aliexpress (www.aliexpress.com) CCTVOne (Amazon Store, www.cctvone.com) Gemini Computers (www.geminicomputersinc.com) www.sears.com www.survellient.net www.syscom.com/www.epcom.net wrightwoodsurveillance.com Nelly's Security (www.nellyssecurity.com) Newegg (www.newegg.com) TechGeekShop (www.techgeekshop.com) Amazon (www.amazon.com)
Moreover Hikvision provides a white list also of authorized distribution partners, whereas I still don't see that for Dahua...