[sdiy] Art of electronics computer

[Dan Snazelle]

I am considering learning about logic , memory, and computers by following along with the labs in the art of electronics student handbook.
They have full schematics and most parts i know where to get.

However, there are some parts which seem hard to find

They require 
Hexadecimal displays (4 of them)

They specify the HP 5082-7340 but i think others would work.
Anyone know where to find those cheaply?

Id also need a few weird logic chips and a keypad. But i think id learn a lot. Especially if i built the entire lab computer with the 68008 and did the chapters on assembly.


Anyone here built this computer OR similar to learn about computers,logic, memory, etc???



Opinions?


Thanks