Twin Cities Costume and Magic sells smaller cakes of mehron makeup. You wouldn't need to buy the Starblend (premium), but could get away with the Paradise blend. I believe a small cake might be around $6-8, but I woudl give them a call to see.
To each their own, I find that Starblend keeps me "blacker." I used paradise at the last Chicago event and had trouble with it not being "black" enough even with multiple coats and layers of barrier spray. On the plus side though, with so many layers it didn't sweat out and into my eyes despite the heat.
I've got my Earth Aura hammer rep repaired, brand new Eviscerate on my character sheet... I should go talk to Dure'dhel about an undead slayer just to be sure.