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Perhaps then it would be worth contacting the organisers of the course to see if they are able to reduce the cost for you, or possibly direct you to an organisation that might be able to help.
Are you currently registered as a PhD student with a university? It may help you find more sources of funding if you are a current student.
Otherwise, use search engines to see if you can find grants for students from developing countries. There are some sites that list a lot of studentships, bursaries and charitable trusts. If you are from a commonwealth country, there might also be some sources of funding aimed at those regions.
Good luck.