I have several pieces of high density foam that came in boxes of equipment. Just look around at a craft store or roam around through a Wal-Mart. Sometimes you find a piece in a hunting or fishing bag, used to make it keep its shape. Yes, buy the bag then cut, or carve the block to fit.
If I ever add a box for my phone or a GPS to my bike, I already have several pieces to choose from and will just need to carve a channel in the bottom for the power cable.
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