World-of-warcraft – How to unblock guild invites

This question gets a bit tricky to answer... Starting from scratch, if you buy just vanilla WoW, you can experience the original world as it has been destroyed by the Cataclysm expansion. You can level up to level 60, but cannot access professions, areas, races, or other such things from any of the other expansions.

In order to access Outland, jewelcrafting profession, and Draenei? / Blood Elf races and starting areas, and level 61-70, you will need vanilla WoW + the Burning Crusade expansion.

In order to access Northrend, Inscription profession, and Death Knight class, and level 71-80, you will need vanilla Wow, Burning Crusade expansion, and Wrath of the Lich King expansion. Oh, and a prior level 55+ character on your account to play as a Death Knight.

In order to access the misc Cataclysm level 80+ areas, Archeology secondary profession, Worgen / Goblin races, and level 81-85, you will need vanilla WoW, Burning Crusade expanion, Wrath of the Lich King expansion, and the Cataclysm expansion.

Those are the restrictions. You can play on whatever realm you want with whoever you wish. You just may not be able to reach all the areas they can.

You can trial every bit of it with the 10 day trial, though I don't quite know how they treat it when your time is up.

Why is the Vial so rare? Because getting it requires that players max out not only their Alchemy, but then also Archaeology, since the formula to produce the vial is only found in Tol'Vir digsites which: 1) Do not appear at all until 450 skill, and 2) Even once you're at 450 skill, they're at best a 15% chance of appearing.

Even then, the formula itself is not assembled directly, but is a rare drop from the also not terribly common Canopic Jar artifact.

So, in short, the Vial pattern is rare because it requires two maxed professions, and an incredibly long grind to locate.

That said, even if someone on your server has the pattern, the odds of it showing up on the Auction House will still be somewhat low because as Raven Dreamer points out, the materials required to create one are incredibly expensive, and largely bought from a Vendor. Thus, even for those with the pattern, they may not be interested in or capable of expending the capital required to produce one just to have it listed on the AH, preferring instead to produce only on commission.

My suggestion? Get the materials together yourself, and then look for someone willing to craft it for a commission, either through your realms forums, or simply in trade chat.