How not to make a profit? By selling your shirts like I am about to. Each shirt cost in production about 12€. plus the cost of the website, the marketing, the business running costs, the cost for a shirt is roughly 15€. Now add the tax you have 17,85€ adding 3€ for postage and packing you get 20,85€. BUT I am planning on doing this flashsale for 20€ a pop
* Shirt (29,99€) plus shipping (3,00€) usually 32,99. Here 25€. Makes a saving of 24,22%