I search for such on Ebay, amazon, craigslist and newegg.

Maybe this would be easier if you had a detail like I need a motherboard for my 1995 Dell Optocon 5555.

I do see one thing that puts this to pre-2010 maybe old and that's the IDE ATA connections. I only run into those with very old PCs where they owner didn't plan to replace it such as some CNC machine.

Tell more.