A cost-effective Ceramic Matrix Composite (CMC) prepreg is presented. Since the major cost driver of CMCs are the raw material costs, a best-cost material needs to compromise on the fibres and matrix ingredients, which furthermore results in a narrow processing window, where the matrix can already sinter, but the reinforcement fibres do not relax yet. In combination with the aim to produce a prepreg, which can be manipulated using an epoxy-based part manufacturing line, several failures are presented.