While many, if not most, Community Patient Organisations cannot afford to pay to fundraise, there are a number of services out there who, for relatively small amounts, offer connections with funders (lists), classes on how to best fundraise (write a good proposal), and work on organisational strategy. One example is www.grantstation.com where you can watch videos that should give you an idea of what you would get if you became a member of their organisation.
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The Council of European Rare Disease Federations provides a platform for the exchange of experiences and information across federations working for different diseases or group of diseases.