I have been using GunDogSupply.com as a source for everything I need for my dog for a couple years. They are seriously awesome; low low prices on very high quality gear. I don’t have a brand recommendation but I have seen several boots on their site.
Just by way of example, I got Mae and Lauren’s dad’s Airedale Molly these really nice, thick, high-end saddle-leather collars, with brass name plates, all totally top-end stuff, for $7 shipped and engraved! And then, they screwed up and threw in a free extra one for Mae and wouldn’t take it back! I was so happy with them I immediately put in another order. I think they are out of Alabama, I just wanted to throw them a bone. One of the best customer experiences I’ve had in years; this has been like 9 months and I still remember it every time I see her collar (which has held up like a champ).
Here’s that collar; I had to go back and check to see if the price was still the same and it was.
http://gundogsupply.com/1-in–leather-collar-by-k-9-komfort.html
There are even nicer collars on there but really, this one was pure leather and even darker/more polished than the one on the site, and it still looks great.
Here’s the dog boots menu:
http://www.gundogsupply.com/dog-boots.html
Zach