Which Calculator? & Good Books

I recommend that every child have their own calculator.  It's sort of like a cell phone, they are all a little different.  If they rely on someone else's they may make a mistake because they didn't know how to use it.  Math teachers do have enough for students during class, but during team study there may not be one, and it would be very beneficial to have one to use while working on homework.  I have tried out quite a few this summer to see the differences.  The one I really like for students is the TI-30 Multiview.  It will last them through high school.  It shouldn't be more than $15.