What is an easy way of getting a SIM card in Poland as soon as I enter Poland?

I am going to poland for 3 years as a student,i was wondering that how i could get a sim card(i'm going on student visa) and which are the best sim card operaters in poland ,which give a bang for the buck

Thanks

You can get them pretty much everywhere but since you need to register to activate the card, it's best to buy from a place where you can register it straightaway like the operators' shops.

The main operators are Orange, Play, t-mobile and Plus.