https://www.amazon.com/dp/B08FJJKSKW/ref=cm_sw_r_cp_apa_glt_fabc_1SSQXX5CCH6RTKN0CXHC
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Etsy has a couple dozen at least:
https://www.etsy.com/market/black_lives_matter_hat
Amazon also has several:
https://www.amazon.com/dp/B08FJJKSKW/