I prefer to pay for the books but I never do that. Ususally I go to the library or download books if the library doesnt have what I'm looking for. Btw, library offers online books too.
Oh yeah... this question I was asking myself for a month now, for I plan to buy a PC. Decided that a laptob will be more convenient, as I do not have much space in my flat for a proper table and a desktop computer. Laptop is also mobile :)
Lenses or glasses? (if we are speaking about what to wear if you have a bad eye sight).