It's hard to say. You might be able to find it cheaper, but who knows how long you'd have to wait and in what condition the bag would be in.
If you do a search for completed listings for "Kooba Talia" you'll see that the cheapest Talia in the last two weeks has gone for $399. Even though the bag you're after is white, I still think you're getting a good deal in the lower 300's.