Comment by jhallenworld

Well Casios are better than TI calculators.

My current favorite calculator is Casio ES-115 PLUS2

https://www.amazon.com/Casio-fx-115ESPLS2-Advanced-Scientifi...

I like it because when you enter sin(pi/12) you get (sqrt(3)-1)/(2*sqrt(2)) in mathematical notation, which is really nice for a $16 calculator.

Here I'm going to hurt TI: If you need a TI-84 or TI-89 for school, the place to get them cheap is shopgoodwill.com:

https://www.shopgoodwill.com/Listings?st=ti-84%20plus&sg=&c=...