The skull nail polishes are £4 each from Revolution Beauty or Superdrug. They have 12.5 ml of product and a 12-month shelf life once opened (although nail polish doesn’t really expire). They are vegan and cruelty-free.
Revolution now has nail polish. Along with the usual cream colours they released a set of neon polishes. I bought two at £4 each. They have 10ml of product and 12-months shelf-life once opened. They are vegan and cruelty-free.