Why is it difficult to get Oppo and Vivo stock in wholesale market?
Oppo and Vivo has very strict policy with harsh penalties in controlling trading activities of their distributors. Instead, Oppo and Vivo offer good profit margin for the distributors and their retail shops. Over time, the result is very limited available Oppo and Vivo stock for wholesale trading.
Unlike Xiaomi, OnePlus, Samsung, ASUS, Redmagic, etc, the low trading activities of Oppo and Vivo also make it unattractive for Chinese flashing technicians to invest their time and resources to make ROM for the China spec of Oppo and Vivo. So flashed version of China spec of Oppo and Vivo literally doesn't exist in market.