These are all stores that I have purchased from, or know are reliable quality product.  They all ship to Canada and the U.S. – but, I am not sure if they all ship outside of North America.  Check their shipping policies before you start adding to your “basket”

Nail Polish

Nail Polish Canada (lots of brands of well known polishes)

Layla Cosmetics (direct from the Layla themselves – expensive to ship to North America – but best selection if you like Layla Polishes)

Ninja Polish (great shop for unique and indie polishes)

Sally Beauty Supply

Fabuloustreet (Nfu and Layla)

Cassie Cosmetics (discount nail polish and cosmetics)

updates – etsy shops for indie polish

TheLadyVarnishes

BlackCatLacquer

IndiePolish

MakeupYourFace

IncidentalTwin

GlitzologyBeauty

DIFFERENTdimension

LacquerheadPolish

FrankenSupplies

FrankenStainNails

BoroughBabeSupply

CanadianMineralSuppy

SillyLilyPolish

lushlacquer

PiperPolish

ThePolishedSisters

Nail Art / Nail Care Supplies

Born Pretty

Wow So Cool

Nail Arts Queen

Viva La Nails

Well.ca  (**use mommylovesnailpolish in the coupon code spot when checking out, for $10 off $40 and free shipping)

TKB Trading (anything you need to make your own Frakenpolish and other DIY makeup products)

Nailiteinc

SalonSupplyStore

lilyyangstore

http://stores.ebay.ca/tomtop-auction?_rdc=1

http://www.tmart.com/Nail-Care/

http://www.lightinthebox.com/c/nail-care-and-polish_519