I'm normally a pretty frugal person, but I still compulsively buy any R/C aircraft that's less than $30.  In the last few years, this has become a problem.

"Lithium Batteries", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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I'm normally a pretty frugal person, but I still compulsively buy any R/C aircraft that's less than $30. In the last few years, this has become a problem.