The one I want to buy is GEEETECH A20M 3D Printer with Mix-Color Printing, Integrated Building Base & Dual extruder Design, Filament Detector and Break-resuming Function, 255×255×255mm³, Prusa I3 Quick Assembly DIY kit. https://www.amazon.com/dp/B07K1FLZ9T/ref=cm_sw_r_cp_apa_i_FzkeCbWMJJ3YX

But first I'm going to try and build a dual extrusion machine from an A8 clone and some additional parts. Just waiting on the mailman.