I always buy my Nick & Nora PJs at Ocean Front Walkers. I've bought about 5 pairs as well as 2 pair of boxer shorts for gifts.
Not only does Ocean Front Walkers have a great selection of Nick & Nora's - the best quality and most creative brand out there, in my opinion - but they have many other PJs and silly boxer shorts as well.
As an added bonus:
1) the woman who owns the store will tell you when new prints are arriving, so you can get the best selection.
2) during the Christmas season, she wears PJs in the store.
This is a great business to support - don't buy your PJs at Nordstrom (booorrring) - go to Noe & visit Ocean Front Walkers.