>>2311147$65 at some crusty surplus store
you can get them for cheaper. i overpaid, but then again that was 6 years ago so price probably went up. search "MSS bivy".
depending on what you have, it might not be a better option. its the only bivvy I've ever owned so i don't know how it compares to others, but ive never felt the need to upgrade. i can say confidently it wins hands down in price to performance ratio.
