If you're just looking to be able to eat them your better strategy is to buy fewer ripe or more green bananas.
for some reason the 'green' ones do not seem to taste as good as the (store)ripe ones even after they are ripe(yellow)
Frozen bananas work quite nicely, when thawed, for banana breads, cakes and cookies or for smoothies.
can freeze a few and use them for a smoothie when the fresh ones run low in the house
I am not experienced in drying bananas so have no advice in that regard.
someone mentioned banana chips as an alternative to buying bananas almost weekly
not sure if anyone has tried to make banana chips