I got this specific wool from here. I'm lucky to live in Australia where Merino are just about everywhere, so I get some wool from here too. But that one is quite local.
World of wool is by far the biggest and the cheapest option for finding wool though. Even with the shipping included. Plus, it's the only place I could find Angora at a price that didn't make me want to die.
Weirdly enough, there's a LOT of fleece on the Facebook marketplace, just more unprocessed. That might be an option with a lot more work involved if you're up to it.
Also, a good place to look is wool and sheep shows. Iirc, there was one in Maryland not too long ago. They generally pop up all around the place though.
Beware. Drum carders come PRICY. They last for life though. I'm going to get into it, but I'm looking into dying (and making my own plant based dyes from my own garden!!)
Edit: not the only way to process wool though. Processing raw fleece is a lot of work from what I've read up on it. World of wool is probably your best bet.