Wholesalers just listing MLS? What gives?

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Hi, I've been searching the internet and MLS for a few weeks to get an idea of prices in my area (central Florida) as I get closer to purchasing my first investment property. I've come across a couple websites that claim to be wholesalers but I've noticed that they typically have the exact same properties listed, which I've also seen on Craigslist or even the MLS. What gives here? Are these people actually wholesalers, I'd love some insight into this from you guys. I don't mind going to a wholesaler to find my first property, but I don't want to get taken advantage of either. Any advice or tips would be much appreciated.