You can get decent prices for RDAs if you go the clone route. If you do go the clone route, I recommend Infinite. The TOBH Atty V2 rda is pretty badass and easy to build on, and you can get an Infinite clone of this rda for around $20-$30 if you do some google searching. As for batteries, I would get the Sony VTC4s - 18650, 2100mah, 30 amp continous discharge rate. For the charger, I have an Efest LUC S2 two bay smart charger and it works very well. As others have said, if you're getting into rebuildables, purchase an ohm reader so your know the resistance of your builds.