What is the HP50 calculator? Is there any cheaper way to get it?

The Hewlett-Packard 50 is a scientific graphing calculator that supports both algebraic and a stack-based programming language. For example, HP50 can display Reverse Polish Notation (RPN). You will need this calculator for EECE 251, EECE 253 and EECE 373, and you can use it in many other courses too. HP49g and HP 49g+ may also work. You can get it for cheaper by getting a P.O. box in Seattle, ordering it online to that P.O. box (approximately $90+no shipping) then going down to Seattle to pick it up. Another way is