STCUSA.com sells the self study for $175. Trust me, you dont need the video lecture. The CD roms that come with the self study are more than enough to get you to pass as long as you can do all the CDs with a 90% or better passing grade before you take the exam.
I did the series 7 with STCusa. I read the manual once or twice and then just did exams for 2 hours every day for I think 2 months. I believe i had around 100 hours of study. I still only got 78% on the test. They say the series 3 is easier and you only need 35 hours of study to pass though.
If you are just trying to save money by buying somebodys used STC study materials, I wouldnt recommend doing that. STC updates their material every year because the questions on the test change year after year and it takes STC a year to update their material. So if you took the test in 2012, you are using study material printed in 2011 and if you buy someones used material, it might be a year old which means you are getting info from 2010.
So I bought the most recent STC for the series 7, but when I took the test, there were some questions on the test that were word for word on the practice tests, but there were some that I had never heard anything close to on the practice tests. If I had used an older STC guide in an attempt to save $40 or $50 I might have regretted it if I missed the test by 1 question because I didnt know that particular material. The exam fee costs $115 for the series 3 and you dont want to have to pay that twice because you got cheap on the study materials, right?
Just my opinion. Good luck with the test.