Well the fedora is a Dorfman Pacific Fur Felt, its been reshaped to actually look like the Raiders hat instead of just a generic fedora which is how they come. Anyday now though, I'll be getting my Adventurebilt fedora from Steve Delk, who made the actual hats Harrison wore in Crystal Skull.
The Siva Lingam Stones are customs that were made by RockFord, they show up on ebay from time to time. My three are part of the first run, He had made one for himslf and I talked him into making one for me as well. Next thing I knew he did 3 more, 5 total, as in the film Mola Ram needed all 5 to rule the world. I ended up buying 3 like he's got in the film, he kept one and sold the other.
The Headpiece to the Staff of Ra, is one of a kind, cast in bronze, gold plated, and with a real crystal, its got the appropriate lesser writings on the reverse side.
The Idol is the Gobler, right now only about 20 are floating around, its extremely accurate, I believe its taken from the original mold, and I know its electroplated gold by the same company that did the original, as well as the Ark and C-3P0. I think only one has shown up on ebay.
The Grail Diary is from ebay, it runs about $300, is very accurate and has a ton of inserts including the Grail Tablet Rubbing.
The Grail is also one of a kind carved from wood, painted and weathered, with the basin gold leafed and sealed.
The Fate of Atlantis Medallion is an Indy Magnoli who no longer makes props unfortunately.
The Crystal Skull was the first one that showed up on ebay and was based on the film's. It's pretty detailed and accurate but the wrong color.
I wrote a short guide before Crystal Skull came out that should be able to help you with most of what your looking for.
https://raven.theraider.net/showthread.php?t=12881
