Zenfoldor's way to get games really cheap, because he loves you:

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That is where I buy most my games unless they are must buys and I have to get them on release. Also if you learn how you could buy broken console fix them and they are as good as new. I just fixed my broken ds phat, and bought a ds lite with it's hinge broken, and another with it's screen broken, for 70 dollars. I plan on fixing both of them keeping one, and then selling the other for profit. If you are young it's a good way to make money, or if you just need extra money it also is a good way.

Edit: Btw it only takes me 5 minutes to fix a broken ds.