but what are they used in? anyone know?
They are basically a microcontroller. You should probably sell them on ebay if you know that they are working.
You could probably sell them on forums for people interested in electronics.
You could also start a hobby, buy some jumper wires, a breadboard, some LEDs, an LCD, etc., and program them to perform a function.
I have about six different microcontrollers. To me that microcontroller has 32K flash memory so it is not a lot of memory to me but it is just a general function microcontroller.
Why would you buy microcontrollers that you have no use for?