Alright. I have looked in allot of sites. And almost each one had different prices. And a few had different tour locations. I need someone who has RECENTLY gone to tell me what exactly does it cost, and where to meet up.
Your best bet is Portland Walking Tours' "underground" tour. In addition to the tunnels they take you on a tour of all of Portland's seedy "underground." It's $19 and leaves from Old Town Pizza at 2 o'clock every day. For more info check the website - Daily Events with Resident Experts | Portland Walking Tours | Oregon. Have fun!