It's two of these bundles from Amazon. They're on a great deal now. We paid $12 more per bundle a month ago.

Confirmed, thanks for sharing!

https://www.amazon.com/Akro-Mils-10124-Plastic-Hardware-6-5-Inch/dp/B01MCSZFVH/ref=sr_1_1?ie=UTF8&qid=1523130424&sr=8-1&keywords=akromils%2B10124&th=1

This appears to be live again if anyone missed last time. Link here.

EDIT: And it's dead again.