I think HP used to do trade-ins where you sent back an old calculator and they gave a discount on a new one. Does anyone know what the history of this is? If they did this do they still do it? If not when did they stop?
I'm thinking of trading in an HP49G for the '+' version.
With the value of old HP calculators HP could make a profit out of this by selling them on to a repair company who could fix up some of them 8^)