buy [sth] in [sth]vtr phrasal sepphrasal verb, transitive, separable: Verb with adverb(s) or preposition(s), having special meaning, divisible--for example, "call off" [=cancel], "call the game off," "call off the game."
(purchase [sth] in large quantities)
大量收购 dà liàng shōu gòu
The shop bought in extra stock to meet the heavy demand from customers.