The only magnetic closure options I know of are not form-fitting like you desire, but rather a folio-type. Strap closures are probably your best bet if you'd rather have a form-fitting case that will stay closed.
I also just wanted to make sure you knew that the regular Kindle is a non-touch screen device. So, if you liked that aspect of the Paperwhite, you might not want the regular Kindle as a replacement.
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