Your friend is right that there are ways to obtain permanent residency or work authorization through investments in U.S. businesses. The requirements are extensive and depend on the amount/location of your investment. You should discuss the requirements related to investor visas (E visas) with an immigration attorney in your area.
THIS ANSWER IS FOR INFORMATIONAL PURPOSES ONLY, DOES NOT CONSTITUTE LEGAL ADVICE, AND DOES NOT CREATE AN ATTORNEY-CLIENT RELATIONSHIP. Immigration is complicated and the wrong action can have serious consequences. Never take action in your case based solely on general information like is offered here. Speak to an attorney who can give you specific advice about your own situation.
Your friend is wrong, in order to qualify for a green card through investment the minimum investment is $500,000. There is an investment visa option where the minimum investment is not explicitly stated but generally $100,000 may qualify. There are also other requirements, so make sure you speak with and retain an attorney before applying. My firm handles these types of cases.
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Legal disclaimer: The statement above is general in nature, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship.