Do they sell Dungeons and Dragons miniatures? If so, is there a large supply? And how're they priced? I'm a large distance away but it's impossible to find a decent supply of good miniatures.

Not individually. They sell the booster packs, the random boxes. Better to call and ask if they have what you want, they can always order things for you.

They have a great selection of minis. And prepare to spend a good amount of money as they can be a bit expensive

They definitely have miniatures, but I can't say how they are priced.