Apple still sells Snow Kitty Server (well they still did in April when I ordered some copies). You have to call and ask for MC588Z, it's 19.99. The normal sales folk should be able to get it but if you DM I can give you the direct line for someone in sales who specializes in the old stuff.
I will say that virtualizing 10.6 doesn't end up as great as you might hope. A lot of games of that era expected video support that fusion doesn't handle well. It's possible parallels is better in this regard.