Whosells

This command will search all vendors for an item that you search for.
If the vendors are found on the same map as you, then you will also get markings on your mini-map to show you the locations.
There are many ways to use the command. Some are simple, some are more complex.
The easiest way to use the command is:

@ws <item id>
@ws <item name>
@whosell <item id>
@whosell <item name>
@whosells <item id>
@whosells <item name>

This will tell you:

1x +1 Katana[4005,0,0,0] | 1999999z | prontera[48,48] | I'mAVendorMa!
Showing 1 to 1 out of 1 found. Prices from 1999998z to 1999999z

Stack size, Refine level, Item Name[Card IDs], The Price, Map and Coordinates, Vendor Name
The last line tells you which ones are being shown, how many were found, and what the price range is.

Example:

@whosell 1117
@whosell katana_
1x +1 Katana[4005,0,0,0] | 1999999z | prontera[48,48] | I'mAVendorMa!
1x +3 Katana[4255,4255,4255,4255] | 1999998z | prontera[49,48] | MeTooMa!
1x +3 Katana[0,0,0,0] | 2000000z | prontera[48,49] | WeAllAreMa!
1x +7 Katana[4005,4005,4005,0] | 2000001z | prontera[49,49] | I'mNotVending. -_-
Showing 1 to 4 out of 4 found. Prices from 1999998z to 2000001z

Forged items will show you the strength and element of the item as well!

Advanced Usage
The @whosells command supports some extra search criteria to help narrow down the results.
These extras can be joined together to make some pretty specific searches.

Refine Level
After something that has been refined to a certain level? Add it to the front!

@whosell +4
1x +4 Drooping Cat | 7000000z | prontera[165,150] | Female Master wizerdXD
1x +4 Bloody Roar | 4500000z | prontera[165,177] | Leonperson3
1x +4 Valkyrie's Shoes[4100] | 3500000z | prontera[164,174] | ThankYouComeAgain
1x +4 High Quality Sandals[4097] | 5500000z | prontera[164,174] | ThankYouComeAgain
Showing 1 to 4 out of 4 found. Prices from 3500000z to 7000000z

This will return all items for sale at this refine level. Add an Item ID after this, and you will get only that item ID at that refine level.
Note: This only works with the item ID. If you don't know the id, use @ii first.
First slotted Card
Putting a card ID in [square brackets] will search by Card ID.
This will only look at the first card slot on all slotted items for the ID you want.

@whosell [4005]
1x +9 Lich's Bone Wand[4005,4005] | 18000000z | prontera[172,160] | MetalVend
1x +8 Pike[4005,4005,4005,4005] | 6000000z | prontera[141,174] | Vendogrim
1x +7 Chain[4005,4005,4126] | 3500000z | prontera[172,169] | MetalVend!
Showing 1 to 3 out of 3 found. Prices from 3500000z to 18000000z

Add an Item ID before the [square brackets] and you will only get that item in the results.

@whosell 1520[4005]
1x +7 Chain[4005,4005,4126] | 3500000z | prontera[172,169] | MetalVend!
Showing 1 to 1 out of 1 found. Prices from 3500000z to 3500000z

Limiter
Too many items for the screen? Limit the results! By putting two numbers in (brackets) separated by a comma, you can control how many results are shown at one time.

@whosell pike (4, 5)
1x +7 Very Very Strong Fire Pike | 100000z | izlude[119,98] | Spear Weapon
1x +7 Very Very Strong Fire Pike | 100000z | izlude[119,98] | Spear Weapon
1x +7 Very Very Strong Water Pike | 100000z | izlude[119,98] | Spear Weapon
1x +7 Very Very Strong Wind Pike | 100000z | izlude[119,98] | Spear Weapon
Showing 5 to 8 out of 14 found. Prices from 100000z to 100000z

The first value is the how many results you want to show, and the second value is the result number you want to start at.

Examples:

@ws +4 2421[4100] (1,1)
1x +4 Valkyrie's Shoes[4100] | 3500000z | prontera[164,174] | ThankYouComeAgain
Showing 1 to 1 out of 1 found. Prices from 3500000z to 3500000z