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A good investment we made back in the winter for our sort of drafty house was 2 sets of the Blackout Curtains for the living room windows. We didn't buy the more expensive tailored ones, we purchased the plain ones and hung under existing curtains. These reduced the drafts around our windows along with keeping heat and cool air inside the house. We noticed that the furnace/air conditioner runs less(especially in the hot evenings since these face west). Back in March, I purchased 1 set for my bedroom and noticed a difference right away.
My goal is to purchase sets for another window in my room and for the kid's room before winter. At $25 a set, they might seem like a lot, but with the less the heat and air run, that is more we save on our bill!