Grey Sauble Conservation Authority annual Tree Seedling Sale in Owen Sound

Does anybody know what day is the Grey Sauble Conservation Authority annual Tree Seedling Sale in Owen Sound in 2011? It was on April 24 last year and it's a great opportunity to get some native trees and berries at the price of $1 or $2 each. I can't seem to find any info on their website http://greysauble.on.ca