Try using "incognito mode" in Chrome (or inPrivate mode in Internet Explorer) to search Kayak, as well as using the advanced search to show +/- 3 days before and after for your flights. I still see flights for $337, just not on the exact days we bought. (Oct 31 to Nov. 7)

They aren't direct flights, very brief layovers in ATL. (50 minutes going, 1 hour 50 minutes coming home). This is the first time I'm not flying direct to MBJ, hopefully it's not a hassle, but couldn't pass up $350 in savings for two people, that's a lot of Red Stripe.