I have one on my sales thread over on the LFGSS site: https://www.lfgss.com/conversations/395390/
It's a large thread though, so look around half way down the first page of the thread. I've reduced it's price from what I asked originally, so should help with your budget.
I have an old Proflex 852 that I'm fixing up, it has a Girvin titanium 1 piece stem & bars (560mm wide). Bolts & stem have a bit of rust on them but otherwise it's working just fine.
I'd planned to keep it with the bike but I'm open to selling it on as the frame is really tatty and the bike will just end up as a beater anyway.
Looking at eBay the only one I can find is £150 in the states (admittedly mint). I could do it for £100 posted. If I'm way out with that price I'm open to ideas but too low and I'd be as well to keep it for myself.
Fairly sure it's 1 1/4" stem but I'd need to double check!
Just as a heads up a '96 Kilauea will not have a 1" head tube, it will definitely be 1 1/8" for sure, so 25.4mm quill needed (or a quill adaptor/shim to suit)
If you fancied something a little different you could also have a search for a Softride or a JD Components stem. They don't seem to be as cheap to get hold of though...
>>>Just as a heads up a '96 Kilauea will not have a 1" head tube, it will definitely be 1 1/8" for sure, so >>>25.4mm quill needed (or a quill adaptor/shim to suit)
Opps....... OK let me try to find my calipers and measure the existing one.