6ft 4, Lefty pitcher, 16 yr old sons HS Baseball Fee

I have a 16 year old son that is 6ft 4in and a left handed pitcher. He made the local high school baseball team which is very difficult to do.  His dad and I are divorced and his dad is not very supportive physically or financially.  I do work but live, literally, pay to pay check because I also have 2 other children.   My son played in the local recreation league since he was 3 because I could not afford the travel league associations. He has been told by several high school coaches that he has a lot of potential.  The school he is playing for is one of the top high schools in baseball around the state of Georgia.  Most of the seniors already have scholarships for college.   Playing baseball for this school will possibly given him the opportunity to get a scholarship so that he can go to college. $600 is the fee to play. But I was informed this does not include all of their uniform and cleats, that is why I am asking for $700.  I would greatly appreciate any help you can provide. I do anything and everything for my kids. My kids come first over my own needs Especially, if it will get him into a good college so that he can further his education.   One day I will give back! Thank you from my heart body and soul!