Personally, I don’t see how this makes him a scammer automatically? You negotiated with the person and came to a deal meaning both parties agreeing to what they are getting and for what price (Both are happy with the terms and conditions). Did he not deliver on your deal? From the information provided above it sounds like you’re only unhappy now because you found out you can actually get it for a cheaper price, but isn’t that how all retail businesses work in general?
People normally have their sources where they can get something for cheaper and sell at a higher price for profit, so it sounds like the person is only doing something that is standard practice in business. All businessmen do the same thing to be perfectly honest. I don’t think outsourcing in itself is considered to be a scam.
So my point is, what makes you feel like it’s a scam other than that? Did he suddenly change the price after both of you agreed? Did he not deliver on what he promised, etc?