Maybe you don’t know, but you can use an old CRT TV as a monitor for the Raspberry Pi.
Find a SCART and some cables for audio and video and you are done.

You need:

1. a cable for the video: it’s a cable with the same type of audio/video plug in each end. The standard color is yellow.
2. a cable for the audio: in this case you must have an end with a 3.5mm stereo audio plug and the other one with 2 audio/video plugs. The standard colors are red and white.
3. a SCART adapter suitable for input with audio/video

Than you have to connect the cables as you can easily imagine.
The only thing to keep in mind is to set the SCART adapter to “INPUT”:

The trick does not need any additional work if you use a NTSC TV.

If you are in Europe and you use PAL systems (like me), you must create a config file in the /boot/ path of the Raspberry Pi while it’s running and configure the appropriate parameter.
vi /boot/config.txt
# Set stdv mode to PAL (as used in Europe)
sdtv_mode=2
#
overscan_left=20
overscan_right=20
overscan_top=20
overscan_bottom=20
Overscan parameters allow you to set a proper margin if you see that the image is not centered.

The end.