Just meet with my Glaxo Rep. They told me that there is a shortage on Fluarix Trivalent(pre-filled syringes) this year and they are cancelling all pre-books. Glaxo suggests to find alternitive sources for you Flu needs. They will still have multi-dose vials available. My question was since I prebooked in Jan will I still have the First come first serve option if I move to vials? No answer at this time. Good luck everyone who has booked there pre-filled like I have.