I hate to say it, but you're better off buying them state side. A lot of the pre-made heads on FT leave a bit to be desired. Another option is to rebuild them yourself, as you'll have total control of the ohms and the vape. Here's a pretty good tutorial:
A PBusardo Tutorial - Vivi Nova Cleaning & Rebuilding - YouTube
I'll unfortunately have to agree with him.
I buy Protank/EVOD heads from FT just to have more parts to rebuild. I don't know if it's the dang wire or the wick they are using, but they tend to taste like garbage. Even buying the EVODs in singles or 7-packs, they all have a really nasty taste to them.
Many people tell you to boil and clean them before you use them but I've done that and still can't get rid of that nasty taste. Everything I buy from FT is assumed to need re-coiled before use.
Having said that, the silica wick that they sell (https://www.fasttech.com/p/1435104) is really great stuff. I see they also have it in 100ft lengths now too ($16.03 Fiberglass Wick for E-Cigarette (30M / 98ft) - 2mm at FastTech - Worldwide Free Shipping).
My next order is going to include a box of these ( $6.80 Replacement Wicks and Wires for Rebuildable Atomizer (50-Pack) 50-pack - 2.0ohm / w/plastic case at FastTech - Worldwide Free Shipping ) just to see if they taste bad or not. If they are usable, man... I can hardly justify making them myself. I just feel bad for the poor SOB who is sitting on a stool all day winding these up for dirt wages.