What camera do you have? The EZ series flashes are older, as mentioned, and that means that they won't communicate with modern cameras. They may work but in manual mode only.
If you have a digital EOS cameras or even a newer film EOS...don't bother with EZ flashes, stick with EX units.
There are off-brand flashes that will work with the TTL metering of modern cameras. Sigma makes one or two that might be worth looking into.
If you really want to save money, you could go with a flash that doesn't communicate with the camera for metering. A Sunpak 283 for example. You would, however, need to know or learn a bit about how to get good results with a flash like that.