I expect I'll be updating this regularly on the following link: http://www.worldofwallstreet.us/gold-and-silver-ebay-vs-nymex-spot-price.html
There's been quite a controversy regarding the availability of individual investor silver, and recently gold. Many have concluded that "THEY" are intentionally limiting the amount of 100 oz silver bars and 1 oz gold coins to keep retail investors from leaving their FIAT-currency paper investments for physical bullion.
This has caught my interest and so for about a week I've been gathering data comparing the NYMEX 4PM closing price (as given by the kitco.com and kitcosilver.com 24-hour graphs) and by tracking all completed (actually SOLD) Ebay auctions for name brand 1 oz gold coins (Eagles, Buffalos, Kruggerands, Maple Leafs, etc. [but not Philharmonics which seem to sell consistently lower than other brands]) and 100 oz silver bars (any brand, but seemingly reputable).
Because I like to consider myself a bit of a value investor, I've been tracking the minimum price for each of the above (except as noted below). This is because I'd like to see what I could safely assume I could get if, after buying such an investment, I wanted to liquidate it.
10/23/2008 - I left out a 1 oz gold Philharmonic at $760 because the seller indicated that it was damaged.
10/27/2008 - Again, the low bid was a 1 oz gold Philharmonic, with a price 40% less than the other lowest coin. I'm going to no longer include Philharmonic coins.
11/11/2008 - Left out a low bid for a single, old Kruggerand (795$) solely because its price was way out of line.