I think both places sell individual THHN rated wire wire of all sizes from #14 to 2/0 by the foot, and #14 through #10 is available in several colors, and solid and stranded.
I think both places sell individual THHN rated wire wire of all sizes from #14 to 2/0 by the foot, and #14 through #10 is available in several colors, and solid and stranded.