Sending SAT Scores to UCs

I have taken the SAT two times before, one in December 2017 and the other in June 2018. I am planning to take another SAT in November 2018 and two Subject SATs in December 2018. I am planning to send my scores to only the UC schools. I am aware that I only need to send my scores to one UC school, that the UCs require all scores to be sent, and that the deadline for score sends is December 31 (I hope I am correct with this 3 things?) I haven’t sent any of my scores yet, so when and how should I send my scores? Should I just go ahead and choose the option “Send Scores When Available” on my December Subject SATs and select the options to send all my scores to one of the UCs?

(This is my first post on CC, so apologies if I have posted this in the wrong place.)

The most cost effective way would be to send all the scores in December. I personally would send the scores you have now and send the rest through the free score reports when you take the other exams. You will be sending the last scores blindly to meet the deadline date.