Wedding Cost

I want a square cake with a few layers (enough for that many people- I think 3) and I want it frosted preferably in butter cream with probably a butter cream filling. Nothing too exquisite but tastes good and looks nice.
I just want to know what an average cost would be. I live in central NJ.
Thank You

seriously, i might get thumbs down for this, but you should really check out walmart’s cakes. we had to have 2 different wedding parties for families far apart and went with them due to price….but the cake was SO delicious. I have never been so impressed with Walmart’s cakes (in 2 different locations). The 3 teired cakes were only $130 and they looked amazing. i strongly encourage you to check them out if you are not picky about themes and stuff.