honestly, atomizers are pointless and outdated. The reason cartomizers are so popular now is because they are more cost efficient while being just as effective. Cartomizers are refillable, an can even be directly dripped on. Look up on youtube how to refill them.
VaporKings.com has great bulk pricing on genuine Joye brand LR 306s and LR 510 attys. IKV is out of stock or gone so often I had to roam. If you're getting 306s the one rule to remember is keep them wet. They're unforgiving if you fire one dry.