External graphics cards and sound cards

So I'm looking to boost up my laptop since it's still pretty laggy even with low settings on CF
I went to Best Buy and they said that they don't carry external graphics cards in the stores and I didn't want to buy a sound card without prior knowledge.

So I'm averaging about 20-40 FPS in a full 16 man room but I want smoother gameplay. I'm not looking to spend over maybe $130ish on one at the most. I've looked online at bestbuy.com since the guy helping me said I can order 'em online but I'm kinda lost.
Can someone post links to decent external graphics cards? I'm pretty new to this whole computer upgrade thing so it'd be nice to get some help :D

And about sound cards, my sound just goes haywire a lot of the times just when I'm watching movies or playing CF so I wanna upgrade mine to something with better quality. I already tried updating the sound thingy where it has it under Gamebooster 2 but it still glitches. Now I'm not sure if you can open up a laptop and switch out the sound card. From what the person at Best Buy said, I think that's the general concept but if you can't do that for a graphics card, what makes a sound card different? Anyway, yeah, same as graphics card, if you guys could just give me some recommendations, that'd be swell. About $130 is the price range for the sound card too.

Also, for the links, please get them at Best Buy. The nearest Fry's is a good distance away and there's no other electronics shop in my vicinity.
Thanks :D

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