What always fascinates me about people who cry foul about "price gouging" is that they don't have a very good understanding of economics.  Basic supply and demand, really.  If demand increases and consumers buy up most of the supply, making the supply shrink (but demand remaining the same) the merchant is literally forced by the market to do one of two things: Keep prices the same, resulting in being out of stock on the hotly desired products, or raise the prices to the level the market will bear in order to keep inventory available for those who want it the most (represented by how much they are willing to pay for the product).

This means that if they didn't raise the prices, they would simply be out of stock and the cards would be outright unavailable.  Would you still be complaining then?  I bet you would.  And I bet you can agree that being able to purchase them for double the price is still a better alternative to not being able to purchase them at all.