I got my 77 400F in running condition for $400 on craigslist. Posted a wanted ad looking for a CB500. A guy down in portland, im 2.5 hours north of portland, emailed me saying he had a running 77 400F that he would let go for $400. Drove down the following day and came home with a running bike. By all means, not a perfect bike, but I've driven places and put 600 miles on it with only changing the plugs.
Got a 76 400F yesterday for $200 with original exhaust. Not running and may never run, but it's mostly there and has many parts I could use on my 77.
As far as I can tell, it's about finding deals and jumping on them, right away. No waiting around. You see something, you call right then and be on your way out the door asking him for directions. I've listed stuff and had it gone in 15 minutes with ten more calls just trying to remove the damn listing. Another good way to find stuff is to post wanted ads, which is how I found my 400F and many other items. That way you're not fighting with 10 other people over one item.
Selling, it's free, no paypal or ebay fees and you can usually find someone who will want anything.
I love craigslist. Too many people out there flagging stuff and it sucks when you can't figure out why, but it's pretty decent overall.
My main gripe is people who list things and then don't answer phone calls or emails. The 76 I got for $200 is a perfect example. It was listed and within 45 minutes I was onto it. I called the guy 10 times that night and two emails, no answer. He finally called me back next day and said he would call back at 2:30, at 2:45, I called him 5 more times but his phone was off. He finally called back at 6pm and was at his house 20 minutes later with cash in hand. Just sick of people wanting to sell stuff, but not wanting to actually sell it, making it more of a hassle to deal with morons than trying to get a good deal!