ITC Vapes is now carrying them cheap(ish) too, at $15.99 for a 5-pack, and they'll sell singles too for $3.39. Not the absolute best price, but pretty sure they're going to be authentic, and it's from a vendor I already like. Beats hell out of the $6 per coil all the local B&M are trying to get, and one of them for sure is selling clones at that price. Grr.
Anyway, ITC's prices works out well for me, get a $35 240ml bottle of juice and a 5-pack of coils and that takes me just above the $50 free priority shipping threshold. Or buy a single or two to pad out another order that's close to $50, and save the $5.00 shipping cost.
Subtank OCCs are only $14.99 for 5, or $3.25 for a single.