This is a gift from God-- the Christopher West Crash Course on TOB for $3.90!
I'm not sure if this is an older edition, but nevertheless, the talks are intense!!
There is (or should be) a talk on Christopher West's theory on Original Sin, that has kept Kevin and me, along with other friends, talking and discussing, discussing and talking. But- you're not allowed to skip to the theory on Original Sin without first listening to the whole course.
Don't forget to order the study guide, too. You'll have to get that at Chris West's website.