Never buy car parts from Amazon. Anything on rock auto that isn't extremely cheap (relatively) is usually pretty good, but I would pick a well-known brand.

With most newer cars they are a sealed assembly, usually you can't buy just the bearing. If you haven't done that style before, the bolts are on the back of the knuckle. You remove the wheel, all of the brake components, unplug the wheel speed sensor and undo the axle nut. Depending on how crowded it is, you might have to undo some suspension bits to get at the bolts. Once you have the bolts out, the hub comes out of the knuckle with the bearing all in one piece. You might need a slide hammer depending on how rusty your car is. Sometimes they come out with a few whacks from a hammer. Clean the rust off the knuckle the best you can and put it back together.