Thanks so much to everyone!
I knew BYC would have some answers.
I got the Equine shavings at the feed store & am trying those.
I have my eyes peeled for second & thirds cuttings of hay, and for straw, locally.
When I run out shavings, I will try the pellets.
I'll let you know what I find, and I thank you all again.
It is great to hear options from people with lots of experience.
I added a two inch layer of sand in the duck coop with a thin layer of the equine shavings on top, and feel better about the set up already.