If you need help with the rock; I live just outside of Copperas... could always drop by and give you a hand..

I haven't been able to find Southdown locally yet... I'll check again next week when I'm in Killeen... ya never know what Home Depot or Lowes might get in... I know some people were using the white playsand from Home Depot... but i don't even know if they got it in this year or not...