Nice score on the parts.
I'm with you on supporting local business, up to a point. A little more money for the convenience is ok but I have my limits.
The reason the column clam shells break here in AZ is because they get so brittle that they just crumble. All of the ones I've had were found on the floor one day. The columns inside that the screws go into are usually the first to fail and the outer surface "looks" ok. I usually patch it together for a while with a plastic straw filled with JB Weld to replace the broken off posts. All the screw bosses will have a bunch of radial cracks around the screw holes. You'll find your screws on the floor and wonder where they came from. Mystery solved....for my climate anyway.

The reason the column clam shells break here in AZ is because they get so brittle that they just crumble. All of the ones I've had were found on the floor one day. The columns inside that the screws go into are usually the first to fail and the outer surface "looks" ok. I usually patch it together for a while with a plastic straw filled with JB Weld to replace the broken off posts. All the screw bosses will have a bunch of radial cracks around the screw holes. You'll find your screws on the floor and wonder where they came from. Mystery solved....for my climate anyway.