Display-only trophies have been a staple of the Super Smash Bros. series for quite some time. But unlike previous iterations, Nintendo has taken some steps to make acquiring each and every trophy a little more manageable, namely the Trophy Shop.
As the name states, the Trophy Shop lets you view and choose trophies to purchase with Play Coins compared to the old-fashion method of gambling coins away. By the looks of the screen shots provided by Nintendo, each trophy will be 300 Play Coins to purchase but can also be available at a 30 percent discount.
By all indications, it appears that the Trophy Shop is only available for the Nintendo 3DS, but, with December still a few months away, it's not outside the realm of possibility that buying Trophies will also be doable on the Nintendo Wii U.