Are you trying to sell them or buy them? Do you want tips?
As with all CPCU tests...make sure you know the definitions cold. I found that flash cards were a great help with this. Kept them in the car. Every time I got stopped at a red light...I could learn a word. If you are going some where and know you will have to wait in line...grab your flash cards and take them with you.
I also outlined each of the chapters. I had the review notes book so I went through that and supplemented with the text book if I needed more clarification of the concept.
540 also has math. I focused on the Time Value of Money equations. The math questions are in section B.
I'm not good at math....figured that if I could do well on Section A and the non Math section B...then I could do bad on the math and still squeak through.
The test window ended today - so I take it you are taking the exam in the next window. The exams are changing from essay to multiple choice. I think that change starts in the next test window.
If you are looking to purchase books cheap...try Ebay. Sometimes you can find them there. Or contact your local CPCU society...they may have a member with a recent set to sell. Again, since the exam format is changing...not sure if the text will be updated for that.