I only buy bedding and food. Their treats are table scraps. Anything else I need lasts a long time, like oyster shells and grit. I bought a bag of oyster shells about 2 years ago and I'm still on that bag. One bag of food lasts about 3 months, so about $8 on food per month. One $7 bag of shavings lasts 2 months so about $3.5 on shavings per month. And I only used shavings for about half of the year last year because my dad was an attorney and I have been using his shredded paper from old files (not the best bedding, I have to clean the coop more often, but its free!!) And as I said earlier my chickens free range quite a bit and get table scraps.