You may get lucky and find one. I was unlucky and couldn't find a decent one the time I was looking, though I was being a little bit more picky. I wanted an old system, but I also wanted to have about the best possible performance for an old system from about the year 2000. I ended up building my own.
Dell Dimensions 4100 Motherboard
Intel Pentium III 1GHz 256kb L2
PC133 RAM 2x256MB
3dfx Voodoo3 3000 AGP 2x 16mb
I kinda had some bad times getting this thing up because the motherboard I selected. It was the cheapest one offered with the most ports. I was a little bummed about not getting one with an ISA slot, but that wasn't the big issue. The big issue was I went with a Dell motherboard that required a special type of extra power connector. I had to buy a special power supply that shipped with the system originally to get it to work. The things are hard to find so it cost me like $23 something for the PSU. Doubled my system cost since the motherboard was only $13 and the RAM and CPU were $5 each. I still can't quite get the Floppy drive to work either and I have no idea why.
Anyways you will want to use Windows 98 whenever you get it built. Its pretty similar just with a bunch of fixes to it. Still can crash every 5 minutes but for the most part it works fine. Once I got it working I was pleased with the results though, plays games really well. Had lots of fun playing things in DOS with the old internal speaker being the only source of sound. I wouldn't pick Dell motherboard again, but I would build it again.
Anyways for you after you find one, if it doesn't have a decent video card I recommend getting a Voodoo 3 3000. Mine was only $6 and it will run anything that Windows 98 will run perfectly.
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