I use to frequent shopgoodwill.com but it has become known that employees sometimes bid on items to drive up the price. I have talked to a few that admitted that they were told to do so.
Want to get a good deal find a local goodiwill, usually they have no idea on how to price things. I have and continue to find $100 items for $3-$10. The only thing I hate about goodwillsis that if they get in vintage computer stuff they automatically send it out to recycle. I have seen people bring in Apple II systems and even a Lisa. What did goodwill do? Dump them. $1200+ machines get scrapped. I even offered $100 on each but would not sell, that is not their policy.