Hey Harry, another option that works great, if there is an OfficeMax near you, they sell a zippered graphing calculator case for pretty cheap that takes just a bit of modification to be an excellent 505 case.
I used an Xacto knife to cut the stitching holding the calculator pocket on and the stitching on the inside of the back cover near the spine. Then you just slide the stock Reader back cover into the now opened slot and you have a nice zip case.
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