eBay is definitely the biggest site to make quick money by selling and buying (then selling it for more) stuff.

eBay无疑是最大的赚“快钱”网站，店家就是通过卖出和买进（然后再高价卖出）货物的形式生财。

youdao

Here in China, in the places where cigarettes and alcohol are selling, you can't see the clear sign of the legal age for buying these stuff.

在中国，在香烟和酒水销售的地方，你可能看不到的明显的标志写明购买这些东西的法定年龄。

youdao

At age 10 he started buying books and other "low-end stuff" at garage sales and re-selling it on eBay.

FORBES: Magazine Article