Cheap optical toslink cable?

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I was wondering if optical cables need to be good quality, like ordinairy cables, or is it pretty hard to go wrong with them?
I am asking as there are $5-10 versions avaliable on ebay, or there are $70-100 versions at retail stores.
Is there a difference?

Also, is optical better than digital coax?
and do you need a special coax cable for digital coax, or will any old one do?

Thanks
John
 
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