Ok. So I retail these at 4,900 Thai baht per piece. My cost price including all materials and shipping on a single piece is 3,300 baht. If I do in a batch of 10, then it comes down to 3,000 baht each. For it to work for me I still need to make at least 1,000 baht per piece. So if you sell then you can make 600 baht on single pieces, or if you take pre-orders in a batch of 10, then you can make 900 baht.