I have a tumblr blog and am looking to build follower. Seem that following and unfollwing is the best way to go, open to other ideas though. We are a music based blog so sfw. I am looking at these two bot right now Tumblr Retribution Bot and FollowLiker bot. I don't want to spend over $50, ideally less. Anyone use these bots or have any other suggestions for something cheap and effective?