YSK that if an item in a store says 2/$10, this does not mean you need to buy 2 to get the deal. Unless the price tag says "Must Buy 2", the price of 1 is still $5.
from /r/YouShouldKnow
YSK，如果商店里的商品写着2/10美元，这并不意味着你需要买2个才能得到优惠。除非价格标签上写着 "必须买2"，否则1的价格还是5元。