A Wi-Fi card will only work where there is an existing Wi-Fi compatible wireless network. Many cafes, resturaunts, libraries, etc provide free Wi-Fi access (or if you buy a drink, whatever). Ask around. In this day and age, it is not hard to find a wireless hotspot or internet cafe (I was able to track down a couple on my trip to Michigan to use a desktop). Wi-Fi tends to be free access, but if you want to use a desktop it will usually cost something in the $9/hr range (or $2.50/15 min).
A Wi-Fi card will only take up as much memory as the drivers use. As a piece of hardware, it does not use memory in itself, but it's drivers do.
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