Logic, logic, logic!!!

[Stefan]

70$ is way to much. I paid like 19€ or so (new, the shop was Dynatech.de).

Maybe its because it is replaced by a newer version (I think its EL-W506 X-"some two character code for the color) which also has the piano style look like the HP300s+. I cannot say anything about the build quality, but the functions are exactly the same. You have to be careful though, Sharp has a large variety of calculator models with very similar names, but which can differ in functions a lot.

Fun fact: I even received a second EL-W506 for free a couple of years ago from Sharp because there was an "LSI-Error" on some devices in a certain serial number range. Mine had one of those serial numbers, so I got a new one. The one which is said to have the LSI Error worked perfectly, so I kept it ^^.