I'm doing my lines (slowly) this month.  Copper-nickel line was $27 for
a 25' roll at my local Fisher/Federated, which was about half Fedhill's
price.  Their price on the nuts and tees was good, though, so I bought
all of them there.

On seized nuts, I've had very good luck this week with two applications
of PB Blaster followed by some jabs on the homemade flare nut wrench
with a rubber mallet.