Downloadable content and Online Pass Code

Hi, i am unable to find Dragon Age 2 downloadable content on the PS Store to buy for my use in the game. what can i do to buy all DLCs on Ps3? Also my Online Pass code for DA2 seems to have expired how can i get another one? i had bought DA2 a while back but only got round to playing now so i can move on to Inquisition... please help.