I advise against bundling cables together. It may look nice, but you can degrade your sound quality that way. The cables may interact with each other's magnetic fields, if they are not shielded, and possibly even if they are. And under no circumstance should power cords be run anywhere near the IC's or speaker cables.
I use something just like you are speaking of. It was a sample we got in the engineering department, but if I remember Newark or one of the other large electrical houses carry these. It was a nylon mesh with velcro--it worked great--I had the exact same issue.
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