What are the speakers discussing?

M: OK, Ms. Torres, I have your price estimate. To have the whole exterior of your house painted, including the fence, will cost you five thousand dollars.
W: That’s quite a bit more than we expected. And actually Colgate Painting said they would do it for four thousand dollars...
M: Well, the cost of paint and supplies is included in the price I quoted you, so we really offer a very good deal.
W: That’s a bit of a relief. If there are no other charges, we’ll probably be able to stay within our budget.
47. What are the speakers discussing?
48. Why does the woman say, “And actually Colgate Painting said they would do it for four thousand dollars”?
49. Why is the woman relieved?