Some things my barn does:
Take a thin older saddle pad fold it in half and place a regular saddle pad on top and now you don't have to wash the thick heavy ones as often.
Buy every thing on sale. Ebay
Dover and other online places where you can get tack.
Turn off the light in the barn when not needed
Fly spray only when needed
Show sheen only like when the need it
Buy kids leave in conditioners for mane and tale de-tanglers
Cut up carrots, so you have more for each horse
Bathe when only nessicary
Buy in bulk!
That's all I have for now!