ADV/Azimut did an S-100 Class awhile back. They appear on Ebay once in awhile, but go for very big dollars (I took the last one up to $650 and let it go).
There was a French company that did an S-36 Class in 1/35, but I don't think they're around any longer.
Unless you can find one on Ebay, there's not much out there. I would suggest going with 1/35th scale and scratchbuilding it...it's not a difficult build, and you can use the 37mm and 20mm from standard armor kits with some minor conversion work.
Jeff Herne