The majority of maps are bought, but a handful of them are quested.
The map vendors are located:
Ashu Bolkhomo - Rabao @ K 7
Elesca - San d'Oria North @ I 8
Karine - Bastok Markets @ H 9
Ludwig - Mhaura @ H 9 NPC
Mhoji Roccoruh - Windurst Port @ G 8
Pehki Machumaht - Windurst Woods @ H 11
Promurouve - Jeuno Lower @ H 7
Rex - Bastok Port @ J 7
Rusese - Jeuno Upper
Violitte - San d'Oria South @ G 10
http://ffxi.allakhazam.com/db/bestiary.html?fmobfunc=13
^ or just use that :3