MCO-IAH-SFO-SAN-IAD-MCO $258 on UA, 4.3 cpm, sample dates 5/10-5/14. Can get lower than 4.3 cpm with connections at LAX and min bonus.
Similar prices for DL
MCO-MSP-SAN-MSP-MCO $256 on DL, 4.5 cpm, sample dates 5/29-5/30
BWI-ATL-LAS-ATL-BWI $242 on DL, 5.2 cpm, sample dates 5/1-5/2