Nice set of plots on price of Palladium -- at http://palladiumprice.org/palladium-price-history.html
Palladium (and Platinum) hit a high last spring due to closure of several mines.
Unfortunately the decrease in price is also shuttering several mines in South Africa starting this December.
with respect to B&S prices - they buy both Pd and Pt in coin form, and dissolve this in acid to start the process of making the necessary salts (per Discussions with Melody last spring). They do buy their coins on the spot market. They undoubtedly have to use the remaining coins in the safe and recover their costs prior to making new purchases. So buy up if you wish to see lower prices in the future ;-). Note that when the price rose, they kept the price low until they had to buy new coins.