Global apocalypse, I have random discount stores

The end of the world is coming, and people are all struggling to survive in the end of the world.
"Oh, how long does it take to cut all the wood needed to make bows and arrows!"
"I'm so hungry, it's too dangerous outside, I can't find food..."
"Who can sell me a gun cheaply? I found a special infected body, and I will be very grateful when I solve it!"
……
While others were still running around to make a bow and arrow, Zhang Cheng discovered that all the products in his store could receive random discounts!
"Uzi submachine gun 0.001% off? Two yuan uzi?"
A few seconds later, Zhang Cheng fell silent with a brand new submachine gun in his hand.

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