The aurora plush ponies have sewn plush hair as opposed to the streamer-like hair of the Wal-Mart exclusives. I have heard that they were seen in a California store, but I'm not sure which stores are going to carry them. You can find them online at Toywiz.com.
My Little Pony Plush
So far, they are shown in two sizes 6.5" & 10". The smaller ones can be purchased with a purse as well.
Personally, I think they look better than the Wal-Mart exclusives, but I can't speak to quality yet as I haven't seen them in person.