The best places to get one of these are:
The adamant battle axe and adamant scimitar are.
battleaxe
you wear a corrupt battle axe andit appears in front of you
All adamant armour like Adamant full helm, Adamant platebody, Adamant plateleg
No, for Bronze, Iron, Steel, Mithril, Adamant, and Rune axes, you do not have to be a member, however, any other axes, Dragon, Barrows, etcetera, is not for non-members.
No, you can strictly only use Hatchets or the Fire Adze.
Grand Exchange
no
Adamant Dragons do not exist. The highest-tier metal dragon is still Mithril.
No, for Bronze, Iron, Steel, Black, Mithril, Adamant, and Runite axes, you don't need to be a member to either own, wield, or buy/sell an axe. However, you need to be a member to wield Dragon Axes, and any other type.
Heroes quest, which also supplies you with the ability to weild a dragon battle axe.
Dragon Dagger, Dragon Battle Axe, Dragon Longsword, Dragon Halberd ----------------- Mainly out of those, Dragon Dagger P++ and Dragon Battle Axe are best. EDIT. dragon claws are better.