How much money should I bring for living expenses during the course?

Obviously this depends on the lifestyle you choose while you are doing the course, for example, how often you eat out in restaurants. It should be possible to live quite comfortably on 80 - 100 EUR (excluding accommodation costs) per week. One advantage of doing CELTA in Sofia is the lower cost of living. In general, you can expect to pay about half what you would in London, Paris, or New York.