I was going to nominate Somewhere in Time by Richard Matheson. It's really a love story, but has a time slip element to it (I wouldn't call is sci-fi though). However, I can't find an ebook version on Amazon UK or US, or any other UK site, and can only find a Nook Book version at B&N and an ebook on Kobo in the US, both priced at $8.99. So I'll have to have another think.
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