Cabelas has one on sale now for $15.
Don't know which Cabela's vest is on sale, but I believe their Armor-flex protected version worth its price premium. Didn't look like much out of the box, but while this vest's unprotected top shows its mileage, the Armor-flex covered bottom half that's taken the brunt of the beating remains unmarked:
If you think I'm wrong, you might be right.
(And to see just how confused I really am, join us in my online blind at: Rick's 2012-2013 season log)
I have used an Avery vest for years with great results. Great to have your retriever protected from drops in core temperature during frigid conditions, along with some added bouyancy.