Socks
Believe me, the quality of dollar store socks is just as good as socks that you could purchase from the department store. Chances are, you may lose one of them in the future, and people would not even see your socks most of the time, so why spend a lot more money?
Party Supplies
If you would be planning to throw a party, the best thing you can do is use disposable cups, straws, paper plates, streamers, and balloons from the dollar store! You would only be using these items for once anyway, so why spend a lot more?