I am establishing a new coop with a wood floor. I will have a 24x35 run if I can ever get my husband to finish the fence. My question is what is the most economical source for litter. I have read on byc that most are using pine shavings but the only place I know to get them is as pet bedding. My coop is about 160 sf and I will not be able to afford that as pet bedding. Any ideas or sugesstions?