You can also look into making your own rennet from Fig Sap. I have never done it but I read it can be done. Not sure if you even have access to fig trees in Taiwan but figured I would throw that at you too.
I have come across some remarks that a vegan form of rennet can be made based on papaya and other fruits, I guess fig is one along that line. Fruits we definitely have enough over here so I will keep on searching for rennet obtained from those sources.
To the posters who can't believe I can't get rennet here...
it's difficult for me too, but I really have tried lot's of places and have reached a point where I usually have found something or it doesn't exist.
The price of milk is also relatively high here (don't know yet about the raw milk), so it would be an expensive hobby anyway - I will keep on working on it.
How much do you guys per for rennet in the US, and do you use tablets or another form? What I found on amazon is about 1 Euro per tablet, which is enough for 1-2 liters. If 1 liter milk gives me around 300g mozzarella 100 g cheese would cost me around 1,5 Euro minimum in ingredients only. I guess making cheese just isn't a cheap hobby, and wouldn't really be an option for our business...