there isn't much available other than Singer - and there are several sellers on eBay. You don't have to buy on eBay, but you can find them and contact them that way.
I have a White that had been reconditioned and painted (poorly) so I'm going to strip and repaint, and for fun put Singer Red Eye decals on it - So I'll have a Red Eyed White (REW) - ok, if you don't know rabbits that probably isn't funny LOL!!