My camera does not have sound is there any way of getting sound on it.

ie. small microphone

Well, you can get a spy microphone from any spyshop, look in ebay, you should be able to find something

just make sure that it has an amplifier built-in.

why do i need to get a microphone with an amplifier built in

I you do not get what is commonly known as a Pre Amp built into your camera then you will need some way to amplify the sound before recording it

thereare ceiling mount microphones, that connect to 2, 4 etc channel systems, with built in amps. Check this link, Ive used them in the past and they are very good.

http://www.spytown.com/lourel.html

would you beleive I cant even find an affordable pre amped MONO microphone in Australia, therefore I hardly ever sell a geo with Audio.

how about this:
http://www.spytown.com/lovemi.html