Viis Ilusalong: European etailer for Nfu Oh. At the moment a very select few colours in stock.
BeautyBay: UK beautysite that carries nails inc., Essie, OPI and Nubar, among others.
Lookfantastic: UK beautysite that carries butter London, nails inc., OPI, Essie and Leighton Denny. Make sure to get on their email list, they often have coupons that saves you between 3 and 10 £ on your order. Free international shipping! Though I have had problems with sold out items still being available on the site - and their packaging being prone to damage, it is the only place you can get butter London at reduced prices every now and again.
beautycosmetic: Bulgarian etailer that carries Catherine Arly, Catrice, Dance Legend, Essence, Flormar and other lesser known brands.
dashicabeauty: Dutch nail art and stamping shop. She has the cutest stamping plates!! And they are with mirror images. Though it is hard to see, she does ship internationally.