I guess this is why I posted...with budgets as tight as they are nowadays, the fact that teachers can't accommodate more than one kind of calculator is ridiculous, especially when one brand is SOOOO much more expensive than another. A PP mentioned that a teacher must use only one because of textbook compatibility, but in this day and age, that seems a bit antiquated. My DD's teacher uses supplements and allows any calculator.
It isn't that the teacher can't accomodate different brands -- it's that it's easier for the student to have the same one the teacher has. Math teachers have a "hook up" -- for lack of a better word -- that allows them to project their calculator from their overhead projectors onto a wall/screen, and THE CALCULATOR that everyone seems to have today is the TI-84 Silver Edition Plus. Students with other calculators will be able to do the work, but they'll have to translate what the teacher's doing to their own calculator. My oldest would have no problem with this, but my math-challenged youngest needs all the help she can get.
When my oldest started high school I asked a math teacher what I should get her. I told her that I didn't mind paying $$$$$ for a calculator, but I wanted it TO LAST. I didn't want to "cheap out" and pay only $$ today, then find out that she'd need the $$$$$ version as a senior anyway. Her math teacher assured me that the TI-84 Silver Edition Plus is the best for high school and college. She told me that if I bought that, I likely would never have to buy another calculator for my student.
When I bought my oldest girl's calculator, this version was brand-new. No such thing as getting it used. I watched and watched, and finally I did a price match from an Office Max flyer to Staples, AND I used a $20 off a $100 purchase coupon, and I ended up getting it for something like $90. Given that it was a brand-new item, I was satisfied that I'd done the best I could.
My youngest is about to start high school, and I was
determined to win her one from ebay . . . but I kept losing the auctions. That turned out to be a good thing though because another teacher GAVE ME one. She had several that she'd found in the process of cleaning out her room/ her lockers (she actually had THREE from which I could choose), and since this was AFTER graduation, I had no qualms about accepting it. Once I popped in new batteries, it worked fine. It's amazing what things students lose and don't bother to look for.