all pixels are made in half meter lengths and joined. I used 5m strips for a number of projects.
I don't think it is worth the money to go through adafruit. They do not manufacture them. At best they are ordering from a known reliable source and performing some QC on their end.
For projects where absolute brightness isn't critical, BTF has a cheaper "Eco" version. For most projects I'm only running things at 20 to 50 max brightness anyway. They use gold alloy bonding wires instead of gold, and don't mount capacitors.