What is name of the hookup wire that appears to be stranded but the strands do not separate when the insulatioon is stripped off. It is commonly used on smal transformer leads.
Wire processing/harness companies have induction heating machines to do this pre-bond operation. Often done when you have wires that are 'stripped and kept' meaning the insulation has been cut and moved slightly down the wire so you see the stripped part still on the end of each wire.
I guess it depends on the gauge you want, some distributors specialize in small wire, others in large wire. Some have a minimum quantity or a whole spool.