Artificial synthesis of peptides

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Is it possible to artificially synthesize your own peptides? How difficult and costly would it be?
I heard that you can use in-tact ribosomes in water and supply them with DNA/RNA and dNTPs; does this work, and where would I get those 3 ingredients? I also heard that some people/companies use modified bacteria to produce amino acids. I assume the ribosome method would be easy since you wouldn't have to worry about the amino acids being bound in the right order.