Here's a link to the hummingbird feeder I like best:
http://www.amazon.com/Glass-Hummingb...dp/B000HHOC3C/
It also comes in a 30-oz size, similar price.
It's glass, which I prefer to plastic, and there's no way bees can get to the food. I use a round toothpick to make sure the "flower" openings are clean and open for the hummers to get their beak through.
Oh, and it doesn't leak!