I'm flying CMB-BKK and about 2 weeks before departure, received an E-mail that the minimum Upgrade Yourself bid was reduced by 25% for a limited time. I'd be surprised if this is flight-specific, partly because it says offer is only available until 31 March (and I fly before then) and partly because the lowest available booking class for business is C, and has been for a while. Will put in a minimal bid and see what happens. Anyone else get a similar offer in the past?