I got a 100 sheet package of Hoshi Nori for about $6 bucks and change at the Korean market by The Pet superstore in Langley, I'm sure most Korean/T&T type stores have it.
Just be sure it's non-seasoned dried natural seaweed only.
Laurie, next time you're there can you pick me up a 100 sheet pack please. It's almost $10 cheaper in Langley than what I found in town.