All DVC resorts are available thru Disney directly. All but SSR are currently selling at $89 per point (150 point minimum for new purchasers) and there are no sales incentives. In addition, you may need to be placed on a waitlist, as DVC does not have ready availability at all resorts all of the time. Their only means of selling resorts except SSR is from forfeitures and ROFR buy-backs.
Many have found that they can find a resale for less without a waitlist.
Regardless which source you choose, be sure to do the math and see where you will get what you're looking for. There are no closing costs thru DVC and maintenance fees for the current calendar year are prorated from the time of purchase. Many resale sellers are also including closing costs and some maintenance fees in their pricing- so be sure to consider all apsects of the resale vs a direct purchase.
You can buy a resale through Disney, but you have to go on a waitlist. The price through Disney is always $89 a point, and there are no closing costs, and you get the full amount of points in the first year.