I got mine from WSP. They have two sizes:
https://www.wholesalesuppliesplus.com/bags-wrap/bags/pour-spout.aspx
I haven't quite got the hang of filling them yet, I'm uncoordinated and a klutz by nature - seriously, you should see me with a paper cutter and more than one sheet of paper, it's hysterical - so I'm slowly figuring out how to keep the pouch stable while I pour (the conditioner is thin, but I still had to use a funnel). I used a straight iron on the lowest setting to seal and that worked beautifully. These might be my new favorite thing.
I don't have anything new to add, but on my list to do for the next two weeks will be foot scrubs, lip balms, and probably more shampoo bars.