I bought a gorgeous
abaya (I'm on the far right) from eBay vendor
Aalrasheed. Mine doesn't open in the front, but the design is such that I could probably alter it to do so pretty easily if I had enough confidence in my sewing skills.
Even when you take shipping into account, they're quite reasonably priced. Here's a
cute one he has up right now. His stock is always changing, though, so if you don't love anything he has up at the moment you might consider waiting a bit to see what else he posts.