Must say that price to Bansko is excellent and I would also take the view that you do have a bit of 'surplus 'cash in the pocket.
Who did you book with and when?
The trip is actually to Borovets - I chose there over the other resorts as there seem to be more pistes; though from what I have read on this forum it seems that Bansko is though of as a better resort than Boro.
I booked on 4 March via lastminute.com, the carrier is Thomas Cook.