If you buy it, it wont be cheap. People charge a lot for their work. I suggest checking Ebay constantly. You may be able to pick up parts here and there until you have a suit, but usually, its someones old suit made to fit them. And chances are, you wont get the whole suit form one seller, which means you will need to paint it once you have it all.
The nature of these suits demand that they are scaled to the person wearing them. If you buy off of ebay, or anywhere really, contact the seller with your measurements to make sure that it will fit.
Even then, you will most likely need to make adjustments. This isnt a fast or cheap hobby, building it yourself is the best (and cheapest) way to get your own set though.
Buying a suit with LEDs will cost you even more, or you can install them on your own if you find a suit that fits.
It IS worth it to watch those videos and do it yourself.
Good luck Arny, whatever you choose!