Camp America are money grabbing - if it's not too late I would cancel and go with someone else. Do you know anyone who has done a camp america type thing before who can help you out with your visa etc? Because I went with Camp America the first year I ever did it and I ended up getting about $500 at the end of the summer and when that was converted to GBP it was pathetic.
I would say try contacting camps directly, as I have been back to my camp three times (albeit only ever once by camp america - they're not stealing any more of my money) and there have been plenty of people who just searched the internet and found my camp and just applied directly. The camp sponsors your visa if it's your first time, and you just have to pay for your flight and your visa appointment fee. My camp even gives us $300 travel expenses. This year I ended up clearing $2000 at the end of the summer, rather than $500 - pretty big difference.
Otherwise I have heard good things about BUNAC and CCUSA, the only thing different about camp america is that they have a forum, which granted is very good, but there's plenty of stuff on the internet that can help, you just have to search for it.
if you want any advice or anything please feel free to PM me.
Good luck!