Its only illegal to transport it across state lines. I think in some states, it's illegal to retail. Ask your local club if you want some. Oregon isn't really REALLY strict, so you should be fine.
As for replacements:
Hygrophila tiger
Hygro bold
Polygonum hydropiperoides
The two hygro's have more color. Most the time, you find hygro polysperma sunset, which has a virus which gives it a really bright and beautiful red color. In my opinion, this plant is next to impossible to kill. I once ripped it all from my tank, thought I took it all out but half a leaf was buried. From that half leaf, over a months time I got eight, 6' stems.
Good luck!
-Caton