Help! My students need Graphing Calculators!

Hi, my name is Mrs. Nardini. I'm looking to stock my classroom with graphing calculators. Many of my students are at a disadvantage because surrounding and more affluent school districts either have graphing calculators to loan or parents are able to afford this very expensive and essential tool. My students deserve an equitable opportunity to learn the calculator tricks that I'm dying to teach them in order to help them to navigate difficult problems that help with college entrance exams.