More teachers are selling their lesson plans online, but some are questioning whether school districts should get a portion of the proceeds. Because the sites, such as Teachers Pay Teachers, are relatively new, some districts do not have policies that govern the practice. "Before, it was really fun to share in my building and get ideas from them," said one Texas teacher who has earned about $650 from her lessons. "But to now share ideas with an entire country of teachers, I think it's best for students."

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