If you don't mind using an Achro:
Andrews
Skywatcher 102 x 500 f5 Rich field achromat includes tube rings, finderscope, diagonal and two 1.25" eyepieces...A$249.00
Skywatcher Genuine "Black Diamond" f5 120 x 600 AZ3 Rich field achromatic refractor...A$599.
Skywatcher 150 x 750 f5 Rich field achromatic refractor...A$999.
MyAstroShop
Skywatcher 120mm x 600 f5 Achromat Refractor Optical Tube Assembly - $449.00
Skywatcher 150mm x 750 f/5 Achromat Refractor Optical Tube Assembly - $995.00
Bosma Beta RE 80mm x 500mm f5 refractor - $349.00
Bintel
Skywatcher SW102 102mm x 510 f5 Achromat - $429.00
and more