Seasonal Item That Can Be Duped And Sold On Auction House For Thousands Of Gold (Patreon)
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I post this one at this time every year, it is a consistent money-maker for me.
The item "Elune's Candle" https://www.wowhead.com/classic/item=21713/elunes-candle
is available from Valadar Starsong in Nightfall, Moonglade. It sells for 10 silver.
The item is unique-equipped which means only one can be carried in your inventory. The item is intended for a quest, but as a cosmetic item it is quite interesting-it can shoot a firework at anything and has 88 charges.
The item is only available during the lunar festival. It can sell for over 5000 gold later in the year.
The price is kept high by the fact the item is unique-equipped but also because most people tend to use at least one charge of the item for the quest it is designed for. DO NOT use the item if you want to sell it-using a single charge means it cannot be sold.
The "exploit" here is simply to bypass the unique-equipped inventory limit by sending it to an alt via a mailbox. This will allow you to purchase more candle's.
There is a mailbox down the ramp where Valadar stands and to the left in front of a large night elf building. Any kind of portable mailbox you may own will be faster obviously.
A tip on selling the item: if you explain what the item actually does on trade chat you will usually find a buyer quickly. Most people do not know or cannot remember what the item actually does later in the year, but they like the idea of shooting their friends with a firework repeatedly.