Hopefully, they won't dissappear too fast. I've seen a couple of used ones-was about a day late for the Hugyfot w/spare camera advertised herein and elsewhere. When he dropped his price to $2800 incl. camera and ports I was ready to jump all over it, but he had a buyer the day I PM'd him. I know there are some differences in controls on the "s", but perhaps they'll make the "s" housing retrofit to both. The 300 housing fits the "s" just fine, but lacks controls for the video. There's talk of a back-only upgrade for current D-300 owners.
Unfortunately, our current plans for an $80K kitchen and bath upgrade limit opportunities for a $5k camera housing upgrade.