Where to buy new diode

Hello Folks,
After several weeks of trying to bring my laser back to the efficiency level I had, I have decided that it might be time to purchase a replacement diode or 2. I bought my engraver from China but I’d like to get the diodes in North America if possible. Can anyone recommend a place I can order from. My laser diode is 450nm and 15000mw.
Thanks once again,

Thank you, if I increase to 20w, will I have to invest in other pieces to accommodate it?

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