US: BOS-SAN/LAS $205-210 RT, 3.6 cpm
This one is unusual in that it is best for only the next 3 weeks (now through 9/26), but includes every day this week. Same day turns possible. Some scattered Tuesday/Wednesday flights available in October, then it appears to open up wider after Thanksgiving, including one two-day stay for $199 RT AI using a direct flight one-way. Fare is also available in 2013. PHL offers the best cpm for those receiving 500-mile minimums, and also appears to be the easiest to find connections through, though connections at any of the four US connecting points (PHL/PHX/DCA/CLT) are pretty close. Books into R, one of the better US MRs I've seen in a while.
If you can fly in the next 2 days or so, use the following promo and connect through DCA both ways to get this down a little further.