How much was your wedding cake?

This is what I am currently working on and checking prices. I literally had no idea that a cake would be a lot of money. I guess I thought wrong. I saw on here where someone was spending 1,000 on their cake and that's fine but definitely not in our budget.
I've checked with about 4 people so far. The highest was 450 and 420. Middle was 330 and cheapest was 220. I just really don't know what to do about this. I want to make sure that it looks good and tastes good, but I don't want to spend a lot of money on just a cake.
We have a friend that can do FH's cake. He wants his to look like a tree stump and be rustic due to a nickname that he has. I don't think his will cost us very much.
We are having about 150 guests and I don't know whether we should have a 3 or 4 tier cake. One of FH's friends got married in March last year and she said she had 250 and her cake was only 3 tier.
We are getting married April 18th and I know there is a lot of time left. I just feel like there is so much to do and I feel like time is going to start to fly by especially when I start back to work. I'm a middle school teacher.