Hi,
Just came across this site a few weeks ago and it has helped me a lot in cutting through some of my fog, but I must admit I'm still basically clueless when it comes to using cells internationally. (technology has passed me by I'm afraid

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I only travel a few times a year, but when I do it's usually 2-3 weeks at the same destination (for example this summer 2 1/2 weeks Prague, 1 1/2 weeks Berlin). I bought a used cell (Motorola 551 GMS- unlocked) and am hoping that was the correct first step. I gather the cheapest rates are going to be by buying local/country-specific cards. (Feel free to tell me I've already screwed up

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Two questions:
1.) Is it a good idea to get local SIMs for the best value when IN the country, but to have an international one to swap out for when travelling to/from/between the countries (or is this even possible a/o easy to do)?
2.) Where do you buy local SIMs other than at a carrier-specific cell phone store?
I waded through various forums but couldn't find the answers to my questions. Sorry if I missed the obvious and asked a typical newbie question for the millionth time.
Thanks,
Mike
PS: FWIW I will most likely not be using SMS, and will probably be using the phone only once or twice a day (maybe 5-10 min) daily.