I think the point is that you cannot order either the batch 8 or batch 9 units at this time. Yes, the officially listed price is 0.58BTC for the batch 8 units, and it's very likely the batch 9 units will be priced lower; however, since you can't actually order one, the price is kind of irrelevant. If you want an S3 right now, you're going to have to find a reseller, or a private sale - and those prices are going to be higher than what Bitmain lists.
The units linked to aren't shipping now either though and there's the chance you might not even receive anything from a "reseller". Buying overpriced miners from ebay and similar sites is just a bad idea.