JMBullion is a pretty good place to order from and they accept bitcoin. You won't find anything below spot but they have a deal for a 10oz bar at spot plus free shipping.
They also have new things on sale every Monday.
http://www.jmbullion.com/starter-pack/JMBullion is a super solid bullion dealer. I highly recommend them for general fiat purchases.
What % under spot are you hoping to get and with how much capital? I've found that from large online retailers you can get about 2-3% under spot with a 3-4 million USD order if you grab products that they stocked just under a year ago.
You smelled something correctly. Just wondering why anyone would sell you any silver or gold for below it's value? Surely anybody wanting to do that would just walk into their local pawnshop, or find somewhere that will buy at current market value.
The best possible price that you will typically find from individuals is on par with what they would get selling on Ebay for common bullion. If you are looking for rarer numismatic pieces you can occasionally hit a good deal. Try searching sivler bullion at 2-3 am and you can pick up some interesting treats. That said, depending on how rare the piece is, its probably worth it to have a decent testing kit because its not the big reputable dealers that make spelling mistakes.
