Save money? That's an oxymoron when you own horses
I try to buy in bulk when I can. Bedding, shots (get a discount when you buy 10 or more doses), feed - when I buy a pallet at a time I get 10% off.
I have one lesson family that "volunteers" their 3 teenage boys to help put up hay every year and I pay them with lessons for their sisters in exchange.
Slick & Easy grooming blocks, buy in large block form from restaurant supply place (they are the same thing that's used to clean flat top grills) & cut my own. I get about 8-10 out of a block that costs about $2. The horse marketed ones are almost 5 a piece.
I take advantage of the "bucket sales" at Rural King or TSC whenever I see them in their ads. I get all the small odds & ends I need & stuff the bucket full, get 10% off whatever you can fit in the bucket and have the extra bucket...can never have too many buckets. It really saved when I bought fencing supplies this last year, I left with buckets full of electric fence insulators, hot rope, gate hangers, etc.