I remember when I bought my first set of Sugar mascara tubes- off of Ebay- and my first Sugar shoes- which I bought for my friend as a Christmas gift, being the generous person I am. They were navy flipflops with a cute yellow rubber ducky on the strap that made noises when ever you pinched it (I so wanted to keep them to myself! I kind of wish I did...the friend lasted shorter than the flip-flops). I just recently bought my first Sugars ever over winter break-- it just sort of happened! They're these dark purple "hook-up cats" (that's the style name).
Over the years, Sugar has just blossomed into an amazing line and successful shoe+cosmetics business (who would know it would work out so well?) based in Irvine, CA. Of course, there's another plus I like about Sugar...I think just about...95% of Sugar shoes are all non-leather/non-suede. I've only recently discovered that they also make the same styles for kids (look at nordstrom.com's collection).
You can find out where to purchase Sugar at http://www.sugarshoes.com - it has a handy list of online retailers. They mention one place, Alternative Outfitters, which is a cruelty-free online store with all non-animal products. Offline, I know I've, for sure, seen them at Urban Outfitters. The only online retailer they're missing from the list is Hot Topic and Swell.com on occassion has them.
They carry a lot of different styles: the beefy boot, the graphic boot, morigami boot, origami boot, the cat, etc... I would stay away from "parka boot" and "da bomb boot" though. Otherwise-- they're so cute and unique. My current favorites: