Well they sell it here for a bit higher. Not sure if the source is reliable though. http://www.aliexpress.com/store/product/Brand-Original-New-Cube-C30-MP3-Player-Media-Player-with-HIFI-earphone-F1-blue-color-only/101027_494167121.html
Hmm well if you did add a bunch of tracks without deleting the system folder on the internal memory it can cause loading problems. I've had it happen before where I added a bunch of stuff and had to delete the system folder to get it to stop scanning indefinitely. But you said you deleted the system folder so I don't understand that.