I agree its easy and there are but when you really start looking, you will find the price tells a lot about the car and also the during of ownership. Seen 3 other 33gtrs after I saw the current one I have and all 3 were around the price range of 25k. All 3 owner owned them for around a yr. And they all have weird sound in them with cheapo mods. These shows a lot about the owner and probably how the car has been treated. I'm not saying anything cheap is bad but chances of scoring 1 thats bad is pretty high.
Only recently I know of someone who bought a 33gtr dirt cheap for 17k, drove for around 6month and wanna sell it for 19k. Seen and heard how the car runs, all I can say is anyone with a brain wouldnt touch it unless you're rebuilding the shit for track (I know some people are desperate to sell thats why their price are low but I'm just saying in general).