Looks like CO has matched UA in gouging passengers to change their tickets. So glad I purchased my ticket from SFO to IAH for August already. It will be my last on a legacy carrier. Once Emirates starts service to SFO, I won't need to get to IAH anymore. jetBlue, Virgin America, and Emirates will take me anywhere I need to go.

FARE RULES TEXT
CANCELLATIONS
TICKET IS NON-REFUNDABLE.
NOTE -
IF ANY PART OF THE TICKET IS UNUSED IT HAS NO
VALUE AFTER TICKETED DEPARTURE DATE.
CHANGES
CHARGE USD 150.00 FOR REISSUE.
NOTE -
ITINERARIES MAY BE REBOOKED UP TO ONE YEAR FROM
ORIGINAL TICKET ISSUE DATE PROVIDED THE PASSENGER
CANCELS THE TICKETED FLIGHT RESERVATION PRIOR TO
TICKETED DEPARTURE TIME. IF THE TICKETED FLIGHT
RESERVATION IS NOT CANCELLED PRIOR TO TICKETED
DEPARTURE TIME REBOOKING IS NOT PERMITTED AND THE
TICKET HAS NO VALUE.