Amazon is selling them as well.

https://www.amazon.com/Homz-Durabilt-Gallon-Stackable-2-Pack/dp/B06ZZNLLP5/ref=sr_1_3_mod_primary_new?

I'm still annoyed that I bought mine just before Home Depot started selling them at $10 each.

And no, the Amazon ones aren't the same size as the HD ones. The one from Amazon is slightly larger, as in I can only tell if I try to stack them.