If something cheap is put on Craigslist the only way you are going to get it is if you go NOW and get it. A 300$ 808 is going to have 20 people an hour calling, you can not wait for stuff like that. I sold a motorcycle that didn't run and was missing half of the engine yesterday on CL for cheap because I just wanted it out of the garage. A guy came 20 minutes after the ad went up around midnight and paid for it. I had 30 or so texts the next morning when I woke up.
You only get deals like that if you call off work and go NOW. Why would anyone turn down the next guy to hold it for someone he doesn't know.