Ahem. So I'm pretty into American Apparel's NEON line of nail polish they're currently selling, having recently been introduced to it by the super steezy Jess of Fashion by Night. It pleasantly surprised me with its quality -- I hate really thin polish that takes a million coats or polish that chips really easily (surprise! I'm female) and this does neither. Throw in some awesome neon shades (I have it in "Neon Red" -- above, and below: bottom left) and these blasts in a bottle get one heck of a jubilant Zack Morris high-five.
Guess what? They're also cheap: $6 USD/$7.50 CAD (earth to American Apparel: you've got the exchange rate backwards). And I know this calls for a big Duhhhh, but: you can buy American Apparel's NEON polish at an American Apparel location near you.