I meant headphone jack

There is no headphone jack on the Canon EOS 500D. And there is
nothing you can do to fix that issue. It also doesn't have a microphone
jack so you can only use the built in microphone. In order to get
good sound you will need not only a microphone but an audio
recorder. A little out of your price range.

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The aim of an argument or discussion should not be victory, but progress.
Joseph Joubert, essayist (1754-1824)

OMG I don't know what to do right now! I can absolutely not afford an audio recorder or a new camera...
Doesn't it exist anything that you can do to get better sound from the Canon EOS 500D? Please answer as fast as possible! ?:(?

I'm not quite sure whether your $150 budget is for the Røde microphone, or if this is the money you'll have left over AFTER purchasing the mic.

If this is all of your money, you have very limited choices. If I were you, I would buy a cheaper shotgun mic (something from China, such as Audio-Technica ATR6550) or similar. That one can be bought for $50 or so. If you have a laptop computer, you might be able to use it as an audio recorder. The ATR mic comes with the small mic plug that can go into your laptop. To record the sound, you can use 'Audacity', which can be downloaded for free. This is certainly not a professional-level solution (when compared to a combination of the Røde mic and a Zoom H4N audio recorder), but it is still infinitely better than recording audio using the built-in mic on the Canon.

Obviously, you'll be editing the recorded video in your computer. Therefore, it doesn't matter that you are recording sound on a different device, separately from video. When you import your video into your editing software, you'll import your audio as well. All you have to do is move that audio along the timeline until it is in sync. By clapping hands in front of the camera at the beginning of each shot, you'll make it easy to synchronise sound to picture (professional film productions use clapper board, of course).

Since you have so little money, your only solution is a heavy reliance on do-it-yourself skills. This would mean things like making a boom pole out of a plastic (PVC) tube (from a home improvement store), making your own clapper board and similar.

Do some googling about this and you'll find tons of ideas from others who already did the same thing. The following two are a good start:

http://filmmakeriq.com/groups/do-it-yourself-film-makers/forum/
http://www.indymogul.com/

Of course, there are many more. There is also that Vimeo Video School, a collection of user-submitted video tutorials related to digital filmmaking:

http://vimeo.com/videoschool

Since you probably have plenty of free time, use it to read, watch and learn about filmmaking.

There is no way to get better sound from that camera.

Good sound comes from getting mic as close to the actors
as you can. With that camera the tiny, little build in mic needs
to be about 15cm from the speaker.

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The aim of an argument or discussion should not be victory, but progress.
Joseph Joubert, essayist (1754-1824)

Thanks for your answers!
I've got a question. Will this work:
A video recorder and microphone (both in one) that's called Zoom h2n
and the Dual Eyes synching program?

Does anyone know if the Zoom h2n is good?

The Zoom is quite nice.

To get good dialogue tracks you need to get a mic as close to the
actors as possible. If you can do that with Zoom you will get good
sound.

=============================================
The aim of an argument or discussion should not be victory, but progress.
Joseph Joubert, essayist (1754-1824)