Sols said:
You can't. At least not a legitimate passport.
The cheapest used to be Comoros at 40,000 USD but they ended their citizenship by investment program.
The cheapest currently on the market are the Caribbean options that start at 100,000 USD.
There are some off-market but legitimate options in Africa and Asia. They aren't official programs but rather discretionary passports granted to people who make a valuable contribution to the country. Those come down to how much the right people like you. No fixed sum. However, for someone to give you a passport for 30,000 USD, you'd have to have contributed enormously in some other way.
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