What would be a good Christmas gift for an LDS (Mormon) missionary?

My best friend left on a LDS (Mormon) mission and I'd like to send him something for Christmas. I know that they have all sorts of rules but not sure what I am allowed to send or even what would be a good idea. So if any LDS (Mormon) mission experts out there would let me know of some good gift ideas for my... show more My best friend left on a LDS (Mormon) mission and I'd like to send him something for Christmas. I know that they have all sorts of rules but not sure what I am allowed to send or even what would be a good idea. So if any LDS (Mormon) mission experts out there would let me know of some good gift ideas for my best friend that'd be great. Thanks
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