I think we're missing a bigge point here guys. Your kid is in an 8th grade math class using a TI-84 calculator. Apparently you have a very bright young man there, and he deserves a high level education. Think about it this way. $120 now for a calculator = engineering degree later = nice house for you to stay and be taken care of when you're 90. Sounds like a good investment to me. Also, I'm an electrical engineer which knows where a deal is for you. Always check this place out, it'll be at your door in 3 days.
http://www.newegg.com/Product/Product.aspx?Item=N82E16844101100
