Mostly I think these are discussion forums. If you have something to sell that doesn't sell in your thread, you can always go to the RC "for sale" forum, or if that doesn't work try e-bay, aquabid, or your local paper.
Personally, I've never had a problem selling what I wanted for the price I wanted in these forums. Unfortunately, I don't think we have too many members in Guthrie, so the drive would have to be a consideration. If what you had to sell was too close to retail price, then you would have to expect people to stay with their LFS or online vendors. If what you had to sell was truly "half price" then there are a lot of people missing out on some really great deals.