I'd be surprised if you could find anything cheaper from SFO. Also, consider burning a handful of miles to get e-cert discounts (1,000 mi for $25 off or 5,000 mi for $75 off) - that'll make your mini MR even cheaper. And, since you'll already have one RT in the bag, make sure to fly two more (even if you have to book the same flights for different days) to take advantage of the fly 3, get 25K RDM promotion.