Bargain offers As a thank-you for buying the best-selling types of KB building blocks , you can get other selected elements (fence roof blocks, palisades or facing blocks) for CZK 1 each. For purchases of PlayBlok building blocks worth at least CZK 50,000 incl. VAT, you will receive, as a gift, a LEGO set of your choice. Buy roof tiles starting at CZK 11, excl. VAT. The discount applies to basic roof tiles as well as all accessory tiles such as ridge tiles, end tiles, etc. The bargain offers are valid until 31 March 2019 or until sold out. Do not hesitate.