Sort of like wine, find a good varietal from a certain winery and the next thing you know they sold out. Wait for the next harvest and hope its as good as the last vintage. (I'm not a wine drinker but I am forced to endure painful discussions about it in my line of work.)
I have found some good fijian kava at a local oriental food market that I think compares with the Van3. Not quite as "creamy" but it's still a good kava. Cost was $22.50 a pound. No doubt kava is becoming more popular.