I love these free $2 Amazon MP3 credit offers because they never care how many times you participate. Most sites would only let you participate once – ever – but I've gotten at least $20 in credit over the years. It's how I've built my entire Devo collection.
In order to get the credit, connect your Amazon and Twitter accounts. This will then automatically follow @amazonmp3 and @amazondeals and tweet out a message from your account. But, you know, there's always that delete button you could press. Finally, you have to follow @heyitsfree for the credit to, uh, be credited to your … ah … credit account bank thingy.
Okay, I made one of those steps up.