How can I get a Visa to do a work placement in the USA?|104790

I would like to do 3 months unpaid work experience in the USA and then travel down the West Coast for about a month but I_m not sure if it_s possible to get a work Visa? The only place I have found to help charges ��699! I am not at university and graduated about 4 years ago so I don_t count for any of the student visas.
Is it possible to get a sponser and how likely is that?
Thanks! Any advice would be appreciated!

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