TUG, redweeks.com, myresorts network, ebay, craigslist, bidshares and friends/family/coworkers just to name a few. MOST of the resell agencies list non exclusively. That means you can sell on your own and pull from them if you want, just make sure they don't have a buyer on the hook before you take another offer. If you're in a hurry, I wouldn't do much on your own. If your ultimate price is the most important, I'd put more work into doing it yourself. I've sold both ways, 2 privately. I netted more on the private sales and the new members got a better deal than they would have otherwise. But it does include some additional risk and effort so you must decide.
Most are 10%, somes 12% but will almost always discount to 10% right off the bat. a few have a minimum amount anywhere between $799 & $1299 but this is not as common as it was a few years ago. Really all a broker does is find a buyer, everything else is handled by the closing company. For the buyer there are a few more benefits buying from a company, mostly if something goes wrong, but it depends on the integrity of the company and the specifics of the situation.
You know, I bought my first DVC contract (OKW) resale in 1994 through an add in USA today of all places. Sometimes I think back on what I didn't know then and just wonder how it all worked out. I'm sure the sellers must have though I was an idiot as I knew just enough to be dangerous. We had toured and been given some incorrect information by our guide. DVC ended up offering to buy it back and reiumburse all our costs even though we'd bought resale. I can still remember holding down the phone and asking my wife what she wanted to do, keep it or let them buy it back. We decided to give it a try, we're glad we did.