All you need to do is find one reliable and trustworthy website online. (latinconexions.com)
oh by the way I bought from e-reader store and if you must buy onyx wait until a more trustworthy website sells them (original or amazon I guess). (blog.the-ebook-reader.com)
Read reviews from unbiased and trustworthy websites such as TrustPilot and Google +. (thebankly.com)