I know that some powers have the Reliable Keyword. Is there an item that prevents me from expending a power on a miss? I've read my share of books, but it is just too many books.
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Not really, they would be much too powerful.
There are some limited items however, like the Pearl of Power from the Mordenkainen's Magnificent Emporium:
But this is a daily power of a 7th level item.
What you can buy is more accuracy, which is actually better.