Sears, Macy’s, Amazon? Sleepys if there is one near you.

All below are Cal King, Humble abode first two, and Room and Board.........the last two Multiple finishes from Room and Board, excellent customer service as well

I was going to suggest Room and Board as well. I don't have anything of theirs, but I've been to their store a couple of times and liked what I saw. I'm in the market for a new bed as well and liked one Room and Board option in particular, but the headboard was designed in such a way to allow the pillows to fall through or hit the wall and, IMO, a headboard should prevent that. That last bed posted by Jan would be ideal if it was entirely wood!

THERE ARE MORE...... @ Room and Board..... and that is without upholstered beds considered. I see no reason that's a big deal. You have bedding on it , yes? Can always do LEATHER.....: )even with storage below.

I am sleeping without a headboard now and my pillow always falls behind the bed in the night. I find it annoying.

We have this bed in a Queen but it does come in a CA King. https://centuryhouseinc.com/product/contempora-platform-bed/