Travel / Mobile Internet in Poland (traveling for a couple of months) [17]

Hi All,
I'm going to Poland for 2 months and taking my laptop and I would like to know of any affordable mobile internet deals. There are fairly cheap ones that have a 24 month contract but the non-contract deals cost something like 300 zl per gigabyte which is ridiculous. I'll be staying mostly in suburban Warsaw for 2 months (mid Aug - Mid Oct).

Any suggestions?

Thanks in advance