I've been trying to compile a list of the portable vendors and then sort that list by attainability.
I know there is one available to engineers, but the character that I would like it on is skinner/tailor, and I already have an engineer.
I was told you could get a guild herald, but then I found out it has a cooldown; I'm looking for something more 'on-demand'.
There's mounts with vendors, but they are in the 20k+ range, which is more than I'd like to spend.
What portable vendor options exist, and how expensive are they?
Best Answer
There are multiple different types of mobile vendor, with differing features. Some will only buy items off you, some will repair, and some have an inventory of items that you can purchase. The items they stock depends largely on the expansion they were released in.
Pets
Mounts
The Reins of the Traveler's Tundra Mammoth is a Wrath of the Lich King mount and will only stock lower level foods and drink, while the Reins of the Grand Expedition Yak has the various Mists of Pandaria goods available for purchase. The Reins of the Mighty Caravan Brutosaur stocks reagents, food, and drink from the Battle for Azeroth expansion.
Professions
Overall, it depends how your character is set up. If you have engineering, the variety of repair bots at your disposal can provide you with a fairly consistent uptime for repairs and selling items. If you've already got plenty of Argent Tournament dailies completed then the task of getting hold of an Argent Squire is relatively straight forward, and if you're in a guild and have guild reputation, getting hold of the guild page/herald is very easy, but these do not provide repair options.
The mounts, while expensive, provide a full range of options but can only be mounted up outdoors (which generally rules out using them inside instances as these are usually "indoors"). The prices of the mounts scale with reputation, so for example, if you've got yourself to exalted with the Kirin Tor, the Reins of the Traveler's Tundra Mammoth will reduce in price to 16,000 gold without the bartering guild perk and 14,000 gold with the bartering guild perk.