need memory

I've been thinking of upgrading my laptop's memory, I can't have it flood with so many files of documents and photos you know. But then again, just with the thought of buying icks me! I know it would cost a lot, and would snag a hefty amount from my pocket. And the husband wouldn't be so happy if he learns about that! with all the stuff we need to buy for the house and bills to pay, getting one expensive gadget would mean WAR! lol. But hey, I am not losing hope here, I heard that there are affordable memory in the market today, the only thing I need to do is find where it is and I will be all set.