- Fast Travel to Riften.
- When you enter, take a right, go down the stairs and across the walkway, you'll be at an ingredients shop. Buy out their entire stock. Leave.
- Fast Travel to Markath.
- Take a left, make your way up to the blacksmith. Buy all her iron ore, usually 1-6. Just past this is an ingredients shop. Buy out their entire stock. Leave.
- Aaaaand repeat.
Now, the Alteration part involves casting Transmute Ore as you run from the Fast Travel location to the shops. Even with low magicka, you can easily transmute about the same amount of ores as you can buy.
- Trip takes about 24.2 hours, meaning you can do this many times before the .2's add up, and the shops close.
- Quickest way (that I know) of gaining Alchemy ingredients.
- Profitable way of training Alteration.
- Not quite enough iron ore can be bought to transmute (maybe investing will help?)