shùliàng yuè duō, jiàgé yuè dī; shùliàng tài shǎo, lǎobǎn kěnéng àn língshòujià suàn

数量越多，价格越低；数量太少，老板可能按零售价算。

The more you order, the lower the price; if you order too little, the boss might charge retail price.