What are the best ways to maximize int score? [closed]

I am playing a level 10 alchemist, and because alchemist needs as much as he can for int (bombs per day, bomb’s damage, craft alchemy, etc.), i want to maximize it. I need the cheapest items i can get, as i almost have no money, as well i need it to well. Any extracts that can do that is great too. As well feats and discoveries.