Poland

[sleepy]

I am going to Poland next Sunday for a week and I am interested in buying a local SIM card especially to connect to Internet (through a PDA and PC).
I have checked all the tables on the site and the country seems promising, which is quite unusual.

Now, the reason I am posting is that I am arriving on Sunday with all the shops closed and the following days I will be very busy and perhaps will not have much (or not at all) tome to get the SIM...

Questions are:

1) Are there shops at Warsaw airport where I can get one on Sunday afternoon? Alternatives?

2) Are there hidden problems? Prices for data transfer of most companies seem comparable (though with some differences), therefore I expect I can get the first I can get my hands on. Fact is, I am back now from Argentina, where I tried to do the same (and there I could spend all the time necessary to investigate), but for cheap data rates either you get a postpaid (impossible for foreigners) or you pay the usual huge amount of money with prepaid (voice calls where rather cheap and easy, anyway). I fear this type of problems...

Had I got more time probably all would be very easy, but much of the difficulty may come from the day of arrival and lack of time (very common in such situations and another help phone operators get against our strive for reasonable rates when abroad...)

I thank you so much for your help!

Sleepy