In the 1960s, Gretsch were far better known for their hollow body guitars, than their solids. Only three solid bodies are included in the entire catalog - down from four in the previous catalog: the Astro Jet was now discontinued. This page details two solid body guitars, the Gretsch Jet Fire Bird 6131 and Duo Jet 6128.
Both guitars were listed (US prices, April 1968) at $375, irrespective of color. Note the offer of additional sparkle finishes at no extra price: