What's M3000 and M2000?
If you mean the M200 series from Swans... take note that Swan's model numbers can be a little bit parkour. In Hivi's store @ Lazada, M240 costs less than M200MKIII. Want more weirdness? M200MKIII+ costs less than M200MKIII.
At least there is some form of correlation between the numbers and woofer size... which brings up another point worth mentioning: For the same model line, it can come in different sizes that cost different.
Is S2000MKIII still available for $485? That's a pretty nice price. Personally don't have any experience with the current Swans models and with Swans coming up with so many models it's hard to predict.