@Chad Oftedal I am only able to buy PDZ in 25lb bags at
Tractor Supply; where do you shop?
When cost is a concern your droppings collection process matters as it is easy to waste. I use drop boards under my roosts and 5 "tools": 1. small stiff scraper to clean dropping from roosts and edges of drop boards;
2. Large feed scoop;
3. Cat litter scoop to pull droppings into the feed scoop;
4. Fine mesh letter tray;
5. Collection bucket to transfer dropping to the compost pile.
Scraper and scoops usage to transfer into the letter tray.
Once in the letter tray I gently shake it back and forth. Granular PDZ drops through the mesh back onto drop boards (a bit of care and you will have an even depth over the boards).
With this approach a bag of PDZ will last at least a month for a flock of 25-30.
Cost & effort are my drivers. I live in Canada where PDZ is generally not available. Once a year I drive to a
Tractor Supply location in the US and buy ten bags. Round trip drive takes the better part of day and costs as much as the PDZ so I try to pick up multiple different items to leverage the trip.
I do my best to keep the coop clean and without smell. Frequency is key! If one let's the waste accumulate it will smell, particularly in the warm months. In winter smell takes much longer to become noticeable but removal can become much harder; waste freezes into a mass that requires a shovel like ice scraper to break apart and remove, no fun and also manages to concentrate most of the PDZ within the droppings so it disappears much more quickly.
So one's process matters! Frequency of droppings removal is key otherwise smells and Flies also accumulate.