There is an ALC leve in Uldah that requires mats you can buy from the ALC guild. It's the one to make potions of dexterity you can spam for 3x. At 25 ish if you have 20ish BOT, you can switch to Quarrymill where there is a leve for Hi-potions of int that you can also spam for 3x.

I got ALC to 50 using these 2 leves.

Always turn in the HQ versions and you make gil hand over fist.