There are two vendors in Limsa that no one seems to realize are there.

One is the Fishmonger that you discovered, Anayrie.

The other is the vendor in the tower immediately north of the Drowning Wench/Airship/Bulwark Hall in Upper Limsa Lominsa.

People also never bother to check the guild vendors. For example, It's amazing how many people don't realize that the armorer guild vendor sells Iron Ore. Or that the Blacksmith Guild vendor sells Bronze Plates, Brass Ingots and Undyed Cotton Cloth.