http://www.newegg.com/Product/Product.aspx...N82E16814999012
take a look. charging 92US for something probably a 5th grader could do in a science class. the materials and manufacture costs probably don't even reach $5.
take a look. charging 92US for something probably a 5th grader could do in a science class. the materials and manufacture costs probably don't even reach $5.







