Aren't there some official links for 10.6 download, since it's no longer the most recent version? I was looking at some Apple stuff last night even though I didn't download anything, and the links came from Wiki's page. I could be wrong of course.
10.6 was never for download, 10.7 was the first OS Apple offered as download.
Thus you are left with finding an overpriced used Retail DVD (originally it cost 29 USD, now it cost 80 to 120 USD via eBay or Amazon) or getting it via torrents.