for other ideas on the glyph market please follow the link to the free Croda's Inscription Gold Guide
The Cataclysm offhands that scribes can craft and sell for nice gold need raw materials that can only be found from a vendor in the Twilight Highlands or from the Auction House.
To reveal the vendors in the Twilight Highlands you will need to complere a quest chain at least once.
The Alliance vendor is Cassandra Downs, the Horde vendor is Una Kobuna.
Personally, i would do the quest chain. These offhands sell nicely and making one round trip a month to pick up 10 of each raw material item is not much to ask - they are available in unlimited supply.
Alternatively, you can sell the items on the Auction House - but i would advise against this. Why allow your competitors to buy the raw materials from the Auction House.