Maybe doing multiple would give your desert table a more full look if your trying to save money and are serving just cake as the desert More
DIY Cake Plates and Pedestals by Thrift My House Blog (thrift & dollar store finds)
dollar stor stove burner covers and candlesticks! Candlesticks are stacked - 1 upright, 1 upside down on top of the other - makes for a higher plate
DIY dollar store cake stand
Dollar Store DIY - Cake Stand. (Possibly use the new counter top refinishing paints to make this food safe?)
How To Make a 3 Tiered Cake Stand For Less Than $10 - I found cake stand hardware on ebay for cheaper than what the site has (she suggested etsy vendors). I like it mainly because it can be taken apart to save on room.
DIY mini cake stands - wood craft circles plus wood candlesticks
25 Great DIY Home Crafts Tutorials
How To Make A Homemade Cake Stand
Clay Pot Cake Stand - you could take this in a lot of different directions! I'd use a food grade sealant on it. I have clear plexiglass cake circles that could sit under the cake without taking away from the look or putting the food directly on the paint.