Hm...let me see.
Mane Tail and Groom spray for rainrot. It smells like barbeque, but it is very effective. It will also help your horse grow hair faster.
Corona ointment for cuts/rubs. Hoover has nearly torn his ear off, and ripped a huge chunk of skin and hair from his chest. I used corona, and he has no scaring or white hair growth (he's dark bay...almost black)
Hamilton halters: I get mine from Tractor Supply. Hoover still have his original one from three years ago, and after a run through the washer in a pillow case, it looks almost new. I get the deluxe kind with the adjustable nose and throat latch.
I'll have to check what my tea tree oil ointment is called. It's great, other than a stings a little when you put it on. It heals rot, fungus, rubs, cuts, abrasions...pretty much anything superficial.
...horse.com is a good place to start poking around at products. They have a nice selection of reasonable to slightly higher end. State Line Tack also has good deals sometimes, but they focus more on English (not knocking English, I'm just a Western rider
) I also shop at Big Dee's and Chick's Saddlery.