Thanks, everybody! Nice teamwork! Thanks to you, I was able to find it on Amazon for $5.02
. It's amazing that this qualifies for Prime shipping and isn't an add-on item, so I'll give that a shot since eBay would take 6-8 business days to get to me. The listing says it fits the 03-08 Vibe, so that's another good sign.
vibenvy - For what it's worth, Car-Part doesn't appear to even have a part listing for any of the hood-support pieces (grommet, rod, or holder clip). Since their search engine requires you to select a part, there's no way to search for it there. Plus, at least in my area, the listings for Vibes are usually incredibly inaccurate. The few times I've ever tried to pull parts, I'd show up and either the Vibe was totally destroyed and picked clean (without Car-Part reflecting that), or there just weren't any Vibes there at all. Between the time and the entrance fees and the possibility of not finding what I need (which so far has mostly been minor bits, or plastic pieces unlikely to survive any accident), I've been content to just track new parts down online or in stores. If/when I get to replacing bigger structural or mechanical components, I'll give the junkyards another shot.