Hard for me to keep eyes on AAPL; hence, I will have open order to start 1/10 position at 555.
May be roll the dice with some CALL options. With APPL options, I learned to take your profit quick. I also tweeted about putting cash to work from 401k, family plans I managed.
There's plenty of cash; hence, I am not worried if the market continues to dive.
Good Luck and I can only post trades near real time during the first hour of the market.