When should I send in my SAT scores?

I am applying to a few schools on December 15th even though there deadlines are in January. I am taking the subject sats this saturday, December 5th and I get my scores back on December 24th. So should I just send in my application on December 15th and then on December 24th send in all my scores including SATs and Subject tests? I am trying to not pay a lot of money to send in all my scores so what should I do?