这里买。。。

5 套钥匙 10刀 （$2/pair)

https://www.amazon.com/Kwikset-Original-Precut-Different-Pairs/dp/B01AR1IBZM

20套钥匙 50刀（$2.5/pair)

https://www.amazon.com/Kwikset-Factory-Original-Precut-Pairs/dp/B00IT5QUJS/ref=sr_1_fkmr0_1