Booked my January trip to SJO the other day, AA had had $515-ish for a couple of days, down from $570-$590, and the other major carriers dropped fares to match. Paid $522 BOS-ATL-SJO on DL, that'll end up giving me enough FF miles on DL for a free r/t in the continental US, and I won't have to deal with MIA coming back. It's also a reasonable schedule, with no long layovers and an additional flight from ATL to SJO that day in case I miss my connection at ATL. The only downside is that I have to get myself to Logan at ass o'clock in the morning but I have friends who can help me with that, and if all else fails I can splurge on a cab.
I figured I wasn't gonna do much better than $570, especially since a bunch of y'all said "just book it already" at that price, so I treated the sale like a windfall and jumped on it.
So I now have a plane ticket and a room at the SL. (Courtyard Wing, unfortunately, but I'll bring earplugs. Also useful if the chica's a screamer.

)