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
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