Yes that power expander is rather expensive, especially for startup. Because the tubing is SDR9/CTS, if you ever run across it in a repair or remodel you can use standard PEX fittings and rings.
As far as our supplies, we use local vendors, although I have recently considered looking into online shopping for bulk items, wax rings, stool bolts, etc. I'm a bit particular about the products I use and matter of fact it took the salesman 5 yrs to talk me into trying the PEX! It wasn't until copper shot through the roof that I gave it a try and now we use it exclusively for new construction.
Your recent remodel experience is almost identical to my introduction to Uponor tubing, lol, it's great stuff isn't it
