All in all, the Soulra is a good for a day at the beach with your iDevice. Hopefully, you can get a crowd to join in your party. You should be able to get the Soulra for about $150.00 on the Eton Corp site.
Also available is the soulra XL, which has a larger solar panel, more speakers, and a place to store the remote control. This model costs about $250.00 and is available here.