Another question about BBTS, I want to set up my account tonight and the first thing I want to place in my POL are the Swerve, Cosmos and Tailgate, Shrapnel sets. But since these are on pre-order does this mean I pay for them immediately or when they arrive, or is it better if I place something thats "in-stock" into my POL first?. Sorry I'm a noob at this.