are parakeets difficult to care for?

and where could i get one, along with a cage, food, bedding, etc if i decided to?
also, what would be the approximate cost of a parakeet?
oh sorry, i didnt clarify

i live in the UK, so we dont have places like PetCo, PetsMart, Wal-Mart, K-Mart…or any of those normal pet stores.
- ohyes_itsbekah