Where I Shop for Nail Art Supplies & Polish
head2toebeauty If I'm gonna buy China Glaze, I always go here. $3/bottle everyday.
Blush Cosmetics UK company WONDERFUL customer support!! Lots of hard to find items.
ebay Especially for large hauls of polish for pennies on the dollar (search for "nail polish lot")
Amazon Where to get the Shany & BundleMonster (sets 1 & 2) stamping plates, also stamping supplies cheaper here than ebay, oddly enough
The Supply Shop Marketed toward pros, great place to get bulk supplies
Ulta Great deals when they put nail polish on clearance (recently had a bunch of the SH Insta-Dri's marked down to 2.49 each. I bought 7 Whirlwind Whites in case they discontinue it!)
Favorite Nail-Related Sites
Community Nail Polish Gallery (polish and nail art swatches galore)
Lacquer Files: Stamping Polish Database (huge list of stampable "regular" polishes, useful though it hasn't been updated in >1year)
Lacquerized (check out her AMAZING tutorials! Her konad tutorial was my bible when I was learning how to stamp and I highly recommend this awesome blog!)
Sasse's Stamping Stampede Polish List (nail stamping-friendly "regular polishes"; last update May 2011)
etsy store (coming soon!)