I'm sorry to say that palladium, rare in nature, is not a popular vehicle in which to invest. Palladium is mostly used by the auto industry and other industrial palladium facilities. The prices are determined mainly by these, not by investors. However, we're lucky that we can buy palladium coins and palladium bars, thanks to the Canadian and Chinese government mints. Palladium coins are also minted in Russia, the Russian ballerina palladium.
If a US bill passes though the senate, we'll have a US St. Gaudens palladium coin! See related article: Palladium St. Gaudens coin.
Pamp Suisse 1 oz bar, Switzerland
Stillwater Palladium Coin, USA
Stillwater Bar Palladium, USA
These are the sites I've used. I'll simply post the links. Keep in mind that some have a $1000 minimum, so for right now you'd have to buy 4-5 ounces of palladium to meet that requirement. Some have a 10 oz minimum. All mark up the spot price 10-20%.
Austin Coin Collecting Society. Very polite on the phone. Even returned my phone call as I left a message! http://acoins.com/palladium.html
BASF Industrial Sales. I haven't dealt with them. http://www.catalysts.basf.com/apps/eibprices/mp/
Monex. Very popular, and I think it's the $1000 minimum. Decently polite, but very busy and they will rush you if they are too busy. Often they are sold out when metals are likely to rise. Many think they are hoarding it until it goes up, so they can sell for more money. http://www.monex.com/index.html
Northwest Territorial Mint. They have a nice palladium selection, though they might be sold out. http://bullion.nwtmint.com/palladium.php
Ebay. Ebay has 100s of people selling anywhere from single 1 oz palladium coins to a dozen 10 oz palladium bars at a time. Markup over spot will like be 50-100% over spot. Paying 50% should be expected, actually, and a 1 oz palladium coin worth $220 spot would be a deal on Ebay at $300. www.ebay.com
Where to Buy Palladium Locally?
Here's a little trick. We all have pawn shops around town and throughout our state. I know you have the Internet, so you have the phone numbers of all those places. Call them up! See what they have. They may have just got some palladium bars in today!