To clarify,
Starting Feb 29 the price for a 1 year subscription will be $400 flat.
You already are "locked" in until you current subscription expires (in 10 months or whatever the case may be) at which point you may opt to purchase a new subscription at whatever the rates are at that time. $299.40 is not a "signup fee" it is what you paid for your 1 year and this announcement does not affect that, you won't have to do anything
Chris