If you are just using the juice of one orange, lemon or lime you don't need to buy a juicer to squeeze all the juice out quickly and effectively. Simply use a fork.
Cut the lime in half and pierce the center with the tines of the fork. Squeeze the lime and wiggle the fork around to release the juice. Repeat with the other half of the lime.
Using the fork and squeezing is much more effective than squeezing alone. I wish I had known this technique when I lived in Panama and cooked with sour oranges every day!