You might give Hawk Suzuki or Trail Tough a call up in Oregon, or Low Range Off Road over in Utah. It would be a bit of a drive but you can probably get a used one from them.
Or you can give someone like Sammy Pro a call and buy a rebuilt short block. A bit more expensive but should be quality work.
I believe you can use a 1.3L from a Suzuki Swift/Geo Metro if you switch to an electric fuel pump, but I don't know about that for certain.