Olive oil is available everywhere, and the quality control is good.
Rapeseed and sunflower is also everywhere. This is fine if it is good for frying. Just don't go much over 20-25%.
Some places I can find corn oil. These are rather low cost. Keep this to a minimum if you try this oil. My sister had some nasty DOS thanks to this oil.
Lard is mostly found only in bigger supermarkets.13,6$ per kg Yikes! Treat this as a premium oil and refrain from using it as a laundry soap ingredient. :?
Castor oil is in bigger towns found in ethnic stores. 14.15$ per liter. This one's tricky. Soap suppliers sell this for cheaper but availability and shipping is something to think about. It's not essential as sugar can also boost bubbles.
Soy bean oil is available, but about the same price as castor and lard. I won't touch soybean oil but I have intolerances to it.
Sweet almond oil is also found in ethnic stores.8$ per 500ml. I never used this in soap but it is nice for a lotion. It seems like a bit of a splurge though.
Coconut oil available in ethnic stores 9,5$. More expencive in supermarkets. Worth it. That's a few dollars cheaper than most stores in my area.
Unrefined palm oil the 9,5$ in ethnic stores. Refined unavailable. If you value your nose and do not like having a yellow lather, avoid this like the plague. It lends for a nice yellow color but little goes a long way.