Add-on Game Content - LittleBigPlanet PSP * Wild West Costume (free) * Wild West Pack ($2.99)
PSP Essentials (Not currently available in Australia or New Zealand) * Open Season (£7.99/€9.99) * Sonic Rivals (£7.99/€9.99) * Sonic Rivals 2 (£7.99/€9.99) * SEGA Rally Essentials (£7.99/€9.99) * Super Monkey Ball Adventure (£7.99/€9.99) * SEGA Mega Drive Collection (£7.99/€9.99)
minis (PS3/PSP) * Fish Tank (£3.49/€3.99)
Add-On Game Content (PSP) * LittleBigPlanet o Wild West Costume (free) o Wild West Level Kit (£2.39/€2.99)
They just decided to release them all as DLC, which is great if you only want to cherrypick a few songs. But yeah, if you want them all, it'd be way cheaper to find a cheap copy of the Green Day game and then export everything.