Want to buy more content, Wii out of blocks

Hi, I have bought many Just Dance songs (most are 200-300 blocks each) and recently did a recent payment. I was going to buy the song, but then it told me I was out of blocks [storage]!! Help!

Update: I tried using an SD card and moved the info onto it, but now I can't access the songs on my Wii game!

The Wii itself has terrible storage itself and the sd doesn't work well anyway. My best answer is to get another Wii (there dirt cheap now) and put your just dance data onto the original. And play all other games on the one recently bought