An actual built-for-A1000 HD is going to be rare. But there are other options. Many A500 HDs will work, they just plug on backwards because the A1000's expansion slot is on the opposite side of the case. It's also higher, so you have to put something under the HD.
There were also some cases built that let you use one or two ZorroII cards (A2000 cards). I had one of those on my 1000 back in the day. It held a 4MB RAM card and a SCSI controller. There was room for a power supply and a 3.5" HD in the box. The A1000's power supply wasn't up to spinning a HD... but I'd bet you could get away with a 2.5" laptop drive.
It would probably be tricky to find one of those expansion boxes now. I sold mine years ago. But there is a hack on Aminet that lets you build a single Zorro adapter for the 500 or 1000. So if you're handy with a soldering iron.
It might also work to hack on an IDE interface... but it's been a while since I looked at that.
-Jim
