Boycott Harry Potter.
Explain your reasoning to a liberal: author J.K. Rowling has been a big donor to Britain's terrible socialistic Labor Party that has ruined Great Britain's economy (more than once) and massively curtailed individual freedom in the land of Magna Carta. Thus, putting money in Rowling's pockets is as bad as buying South African oranges at the height of Apartheid. Your conscience simply wouldn't allow you to contribute, in however small away, to the kind of government that oppresses free people. They may be Limeys, but Limeys have rights too!

Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
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Scarlet Chord Ministries   Isa 1:18