Well, if it helps, here are the vendor mats that I can remember. This is from memory, so there may be some errors when I list more than one guild. Bold items are ones that I stock anyway because I get annoyed repetitively going back for them (even at level 50).

Weaving items:
Moko Grass (Weaver's Guild)
Hempen Yarn (Tradeskill vendors, various other guilds)
Undyed Hempen Cloth (Tradeskill vendors, various other guilds)
Cotton Boll (Weaver's Guild)
Cotton Yarn (Alchemist Guild)
Cotton Cloth (Blacksmith Guild)
Carnation (Weaver Guild)
Straw (Weaver Guild)

Leather Items:
Animal Skin (Leatherworker's Guild)
Leather (Tradeskill vendors, various other guilds)
Animal Hide (Leatherworker's Guild)
Animal Sinew (Tradeskill vendors, various other guilds)
Hard Leather (Weaver's Guild, Blacksmith's Guild)
Beast Sinew (Leatherworker's Guild and Weaver's Guild at the very least)

Blacksmith/Armorer:
Copper Ore (Tradeskill vendors, Goldsmith Guild, Armorer Guild, Blacksmith Guild)
Tin Ore (Armorer Guild, Blacksmith Guild)
Iron Ore (Armorer Guild)
Jellyfish Humours (Blacksmith Guild)
Clove Oil (Blacksmith Guild)
Bronze Ingot (Tradeskill vendors, Blacksmith Guild)
Bronze Plate (Blacksmith Guild)
Bronze Rivets (Tradeskill vendors, Blacksmith Guild, Carpenter Guild)

Goldsmith:
Copper Ore (Tradeskill vendors, Goldsmith Guild, Armorer Guild, Blacksmith Guild)
Copper Ingot (Tradeskill vendors, Blacksmith Guild)
Zinc Ore (Goldsmith Guild)
Brass Ingot (Blacksmith Guild)
Clear Glass Lens (Goldsmith Guild)
Ram Horn (Goldsmith Guild)
Bat Wing (Goldsmith Guild, Tradeskill vendor)
Bat Fang (Goldsmith Guild)
Soiled Femur (Goldsmith Guild)
Bone Chip (Tradeskill vendors, Goldsmith Guild)
Raw ~Level 14 Gems (Malachite, Lapis Lazuli, etc) (Goldsmith Guild)

Alchemist:
Rock Salt (Tradeskill vendors, Alchemist Guild)
Muddy Water (Alchemist Guild)
Jellyfish Umbrella (Alchemist Guild)
Chanterelle (Alchemist Guild)
Coral Butterfly (Alchemist Guild)
Princess Trout (Limsa Lominsa Fishmonger - May be remembering wrong on this)
Copper Sand (Alchemist Guild)

Carpenter:
Maple Log (Tradeskill vendor, Carpenter Guild, Alchemist Guild, Blacksmith Guild)
Maple Lumber (Tradeskill vendor, Alchemist Guild, Blacksmith Guild)
Maple Branch (Carpenter Guild, Alchemist Guild)
Ash Log (Tradeskill vendor, Alchemist Guild, Blacksmith Guild)
Ash Lumber (Tradeskill vendor, Alchemist Guild, Blacksmith Guild)
Ash Branch (Carpenter Guild, Alchemist Guild)

Culinarian:
Too many, but they're all accessible in Limsa. Visit the Bismarck, Tradeskill vendor and Fishmonger. Since you can see how many of each existing item you have in the menu, can use it as a reference to vendor.