I need to know some prices....

[ccwarner]

I feel weird b/c i'm not a landscape designer or anything-yet- but that's why i'm here. I'm in a class at Brigham Young University for landscape design and we have a project due - today actually- and I need a few ball park prices on a few things such as
220 sq ft deck-wooden
10 by 4 ft wooden pergola
5ft bench
400 sq ft of flagstone for a walkway
7by4ft water pond
If anyone could help me- I just need an educated guess really...
Thank you so much