to sell books or paper (see Molina); this is from amatl, paper or books, and namaca, to sell
IPAspelling:
ɑːmɑnɑːmɑkɑ
Alonso de Molina:
amanamaca. n. (pret. onamanamacac.) vender libros o papel. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 4v. col. 1. Thanks to Joe Campbell for providing the transcription.