I can hardly believe it; I purchased a keyboard, a Casio WX-200 for $10.  I got it from our local thrift store.  It is in amazing condition and after reading through the user manual, I find it has a lot of the bells and whistles that I have been looking for in a keyboard.  It has general Midi, accompaniament, recording, sampling sounds, Midi connection to an external Midi network (via a USB-B connector), and both speakers and a headphone jack for listening to what you are doing.  I only had to add a power supply and a USB cable to the mix. I am looking forward to pushing myself to learn to keyboard/piano with this thing while I have the chance.  Such a great find.