Well, I'm not sure if this is exactly what you're looking for, but my cheap childbirth prep has been reading the Emergency Childbirth Manual (by Gregory White- you can download it for free online) to my husband for a refresher. Partly in preparation for a possibly fast labor, but also because it's written in the perfect matter of fact tone for a man to appreciate (at least mine does, anyway
. It covers the basics of labor and goes over what to expect of the woman in labor and the best ways to be helpful to her. I don't think I still have the link, but I'd be happy to send you the PDF if you want it.
My take on a cheap soundtrack has been the Lifescapes cd I got at Target for my daughter to sleep to. It's completely calming piano music (the one I got was Calming Rain). Anything meant for relaxing to meditate or sleep seems to be a good bet to me. I'd also go for Gregorian chants, but I haven't actually gotten that yet.
As for online resources, I've just focused on reading empowering birth stories. I've tried several sites with stories that I just didn't find particularly positive (like stories that focus on the pain or where everything went wrong), so I've ended up reading most all the stories on Laura Shanley's site (http://www.unassistedchildbirth.com/unassisted-childbirth/birth-stories/
). Even though I won't be planning an unassisted birth, it's wonderful to read so many stories of women who don't perceive labor as painful and who get the birth of their dreams. I know this is a very personal preference, though, as to what speaks to you most, but I benefit more from encouragement like that than a how-to for labor and relaxation.
So that's very specific since it's just what I have found myself doing, but I thought I'd share in case it helps!!