the grey market

剑桥词典

an unofficial but not completely illegal system in which products are bought and sold
（非正式但竝不完全非法的）灰色市場
The store sells designer clothes and shoes sourced from the grey market . 這家商店出售從灰色市場進貨的名牌服裝和鞋子。
比較
black market

buying and selling of a company's shares before they are available officially
（在公司股票尚未正式發放時進行交易的）股票灰色市場，暗磐市場
First dealings in the company's shares will start on the grey market on 27 March and formal trading begins on 2 April . 這家公司的股票將於3月27日開始進入暗磐市場，然後在4月2日正式上市交易。

people over about 50, considered as a group to which products can be sold
針對50嵗以上人群的市場，白發市場
Motorbike manufacturers are selling to the grey market as much as to younger people . 摩托車制造商們賣給白發市場的摩托車和賣給年輕人的一樣多。 返回 the grey market