As
@rew pointed out, you can get them from Wholesale coils, currently on offer at £7.29 for a pack of 5, plus an extra 5% off if you buy 2 or more packs. I bought 2 packs, comes in just under £7..and free postage too. Had a look on the site, and these coils are currently cheaper than the standard Nauty BVC coils offer price!
https://www.wholesalecoils.co.uk/co...spire-nautilus-aio-nic-salt-coils-1-8-ns-5-pk
This it the only place i buy my Nauty coils from, they're genuine, the company is relaible, competitively priced and quick postage too.