Never ordered, just checked fasttech:I've ordered extra RBAs from several sites (myvaporstore, directvapor, etc.), but it's the screws that are the only thing I've had to replace over the last year. You get extra screws when you order an entire STM, but not when you order the rba as a standalone. Just wouldn't mind having an extra little package of those little screws.
$8.14 Replacement Phillips + Hexagonal Screw for DIY E-Cigarettes (200 Pieces) 200-pack - stainless steel at FastTech - Worldwide Free Shipping
$1.50 Replacement Socket Set Screws for Atomizers (20-Pack) - M3*4mm at FastTech - Worldwide Free Shipping
$1.21 Replacement Phillips Head Screws for Atomizers (20-Pack) - M2.5*5mm at FastTech - Worldwide Free Shipping
etc.
I have now idea which screws go where. If somebody does know even a little bit, please let us know also.