How does cacaoBonus work? For each book you buy, you shall receive a bonus of 1 (one) Euro. In the left column of your member page (to be seen only by you after you have logged yourself in, you can follow up your state of account. If you collect enough Euro Bonuses (Example: if a book costs 12,50 Euro, you will have a Bonus of 13 Euro Bonus. The remaining 0,50 Euro Bonus will be added ...) you are entitled to choose a book between those available. We will send it to you free of charge by normal mail. In case you would liketo get it by priority mail, we will charge the delivery. Please note the posting charge section. Click here. If you make your friends buy our books, you will receive a Bonus of 1 (one) Euro on the first book he or she bougth. Aditionally, also your friend will receive his Euro Bonus as written above. Your accumulated Bonus will be valid for two years. In case at the end of two years you have not accumulated up to twelve Euro Bonuses or ... not use ... ... it, your account will automatically restart from zero. The two years period starts from the date you buy the first book. The Bonus will never be sent to you in cash. Enjoy your c a c a o Bonus!