I found them on Amazon. I will say, this was the hardest crochet hair I worked with yet. I destroyed a half pack of hair in the process, but it turned out so well and people compliment it constantly so I’m definitely going to be buying again.
https://www.amazon.com/dp/B08HD1S3ZL/ref=cm_sw_r_cp_api_glt_fabc_A4RQSKF8W6BPCWE5BQQ9