I almost forgot! I also use coupon code SPETS2-5 (along with the current free shipping code) to get $5 off. And that is $5 off EACH HORSE...so I just give each supplement a different horse name and wah-lah! $5 off each 28-day supply of supplements!
I also use their handy comparison charts to find a high dose supplement, and then do a .5 scoop. For example, my farrier recommended I give my horse 10mg of biotin each day. Well, a 1/2 scoop of Grand Hoof Pellets is 10mg and only 30 cents per day. The cheapest 10mg (full scoop) biotin supplement is Shoer's Friend for 44 cents/day.
Also, whenever you get supplements for a new horse, they send it in a 16 qt Steralite drawer. So, every time you rename your horse for that $5 savings, it comes in a drawer. Well, what are you going to do with all those drawers? Sell them on craigslist? Exchange them at your local retailer for some cat food?
Oh SmartPak, I love you!
Plus, they have awesome products and amazing customer service.