Used pet hay/straw (Duren Ave)

I have small pets that have hay in their cage, and I use it for garden fertilizer. If you also have pets that make a lot of hay litter and would like to offer it for me to use, I'd appreciate it. I'm building several hugelkultur beds and need a lot of biomass. Logs or weeds would also be helpful if they're from trees/plants not too close to the road or other pollution sources.