They don't make the Royalex fabric anymore, at least I don't think they do.

  People are scrambling to come up with an alternative.
  I read where Novacraft had their own material so I looked online.

Before I went to their website I saw these video's on YouTube.
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  Here's a link to their website.
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   They're are some other video on YouTube of people testing this material out.

  Company has been around a long time so that's good.
  They have a link on their website to a explanation of the various materials you can have a canoe made of.

  This should get you going.