I was buying pre dec below spot on eBay at around spot $15 / oz.
I wasn't a stacker at the time, around 2006 I guess, just a coin collector recently moved over from the UK and I was putting together a set of Australian decimal coins from circulation. I heard about the round 50 and figured I would never get one in change.
So I went on eBay to try and buy one and they were about $4.50 each. Which I worked out to be just below spot.
I figured that you could buy silver for less than it was worth and you got a coin as well.
So I looked around and there were loads of auctions finishing below spot value.
I just bid on all of them, with a top bid that was equal to the spot value of the items less the postage costs.
I lost about 9 out of 10 of the auctions but everyone that came in was cheaper than spot.
I think 300 post 3p coins was probably the biggest bulk purchase but I had lots of smaller packages every week.
I miss those days!