To save yourself some aggravation and money, it’s okay to fill the base (no more than 1/4-1/3) of your raised beds wit styrofoam packing peanuts and or empty pop cans for drainage. Don’t kill yourself by trying to fill the base with stones, like houseplants!
Daisyjane have you made your move to Texas yet?
I use pine cones in the bottom of my containers....it won’t let a lot of soil thru the drainage holes but water can drain away okay and you don’t have to use so much potting soil...