It's difficult to estimate exactly how many people buy their miners online for crypto mining, as it depends on factors such as geographical location and access to hardware. However, online retailers such as Amazon and Newegg offer a wide range of mining hardware options that can be shipped worldwide, making it easier for individuals to get started with crypto mining. Additionally, many mining equipment manufacturers have their own online stores, allowing customers to purchase directly from the source. The convenience and accessibility of online purchasing have likely contributed to the growth of the crypto mining industry in recent years.