I recently leveled enchanting on an alt character and reached a point where Infinite Dust was simply too expensive to buy from the AH ( especially when you need 30 or so stacks ). I then thought to myself, what are some cheap ways to obtain some cheap infinite dust? My first thought was shuffling eternals, which turned out to be a great way to obtain some very cheap dust & essences, but that was not enough. I need more enchanting materials and there were no more eternals listed at the AH so, I started doing some research on what items you can craft and then disenchant to yield wrath enchanting materials.
Below is a list of the items that are worth crafting to obtain cheap infinite dust, I found one of the second best methods apart from the eternal shuffle is buying borean leather and crafting any of the named items in the Leatherworking section. I found Leather to be as cheap as 15g/stack and it was plentiful, check what your server has for cheap and proceed to craft X item then DE it for the dust.
8 Cobalt Bars, 4-7 Infinite Dust
Horned Cobalt Helm
8 Cobalt Bars, 2 Crystallized Water, 4-7 Infinite Dust
Reinforced Cobalt Shoulders
Reinforced Cobalt Helm
Reinforced Cobalt Legplates
Reinforced Cobalt Chestpiece
1 Gem, 2 Crystallized Earth, 2-3 Infinite Dust
Crystal Chalcedony Amulet
Crystal Citrine Necklace
Sun Rock Ring
8 Borean Leather, 2-3 Infinite Dust
15 Frostweave Cloth, 1 Eternium Thread, 2-3 Infinite Dust
In the end, this is a great way to make leveling enchanting cheap, or simply make some gold with a little flavor. Don't know what to do with all the Infinite dust and essence you've gotten? Why not craft some Major Agility scrolls and list then at the Auction House?