Analog film photography and cameras

So I have like 20 undeveloped films, some colour process, some B&W, that are up to maybe 5 years old. I have absolutely no idea what's on them. What's the cheapest way of finding out?

AGPhotolab I found these guys to be particularly good and speedy. The scans to CD are by no means amazing, but I asked politely and they gave me 300dpi scans. It's a cheap-ish way of finding out what on film.