We're willing to extend our $30 price limit a bit for certain key pieces like a great coat or pair of boots... possibly even up to $100, but all of these pieces are half of that, or less!
Our Polyvore set includes both brights and an incredible zebra option (animal print is classically awesome no matter the season or style, but it is hot right now), $29-$50 (click the pic for links to purchase):
These are from some unexpected sources (Nine West at Wilson's leather? Home Shopping Network? Patagonia?) but they're all lovely and quite affordable.
If you prefer to score something that no one else will have, try a vintage piece from Etsy. All of these stunners are under $50 as well: thrifty and environmentally conscious (bottom right, orange, is only $8!!

Are you going to buy a new trench for fall? Would you consider vintage? What colors do you like best? (We're dying over the purple one, of course!)
Happy Friday and happy shopping!