Merchant

Merchants are NPCs who sell and buy items at a fixed price (as opposed to Traders who offer a variable price based on supply and demand).

Merchants can be found in each town, and in a few select extra locations. They are always denoted by the [Merchant] tag added to their name.

You may usually sell any item that is in your inventory, so long as it has a gold piece value of greater than zero, however, merchants may not give you as good of a price for a trader item as the trader for that specific type of item (i.e. Dyes, Runes, etc.).

Note that every Crafter is also a Merchant, but they only buy goods.

Merchants generally buy goods at half the price that they sell it for.

Standard
The the standard assortment of goods for merchants is the following:

In addition to this standard merchants usually sell the Key for their region, plus other items as listed below:

Pre-Searing
Deviating from the a.m. standard, merchants in Pre-Searing Ascalon do not offer Expert Salvage Kit and Rune of Holding. Instead they offer the following items:

Note that the Salvage Kit sold in Pre-Searing is the "small" version (10 uses for 40 gold).

Ascalon
Most merchants in Ascalon offer the a.m. standard, plus the Ascalonian Key.

Exceptions from this rule are:
 * Arnaud and Laren in Ascalon City do not offer Expert Salvage Kit and Rune of Holding. Instead they offer a Belt Pouch and a Bag (Arnaud) or Starter Elemental Rod (Laren) respectively. Also, the Salvage Kit sold by Laren is the "small" pre-searing version (10 uses for 40 gold).
 * Gram in Regent Valley, the only merchant in a Post-Searing Explorable Area, has a much reduced assortment.

Northern Shiverpeaks
In addition to the a.m. standard, merchants in the Northern Shiverpeaks offer Bags and Steel Keys.


 * Hakon in Beacon's Perch also offers the Shiverpeak Key and Dwarven Ale.

Kryta
In addition to the a.m. standard, merchants in Kryta offer Krytan Keys.


 * Bodrus the Outfitter in Lion's Arch offers a Bag instead of the Rune of Holding.
 * Hasrah at the Temple of the Ages offers Obsidian Keys and Phantom Keys.

Maguuma
In addition to the a.m. standard, merchants in the Maguuma Jungle offer Maguuma Keys.

Crystal Desert
In addition to the a.m. standard, merchants in Kryta offer Elonian Keys, Scrolls of Insight and "Superior" Kits:

Southern Shiverpeaks
Merchants in the Southern Shiverpeaks offer the same assortment as the merchants in the Crystal Desert, except they sell Shiverpeak Keys and Miner's Keys.

Ring of Fire Islands
Merchants on the Ring of Fire Islands offer the same assortment as the merchants in the Crystal Desert, except they sell Darkstone Keys.