Not sure exactly what you are looking for, though there are many Aluminum Frame 3D Printer Kits that are less expensive than the combined parts.

Myself I purchased Two used for less than the price of a single 3D Printer.
Now I am using the word "USED" loosely These were never used because they never printed a model after assembly, Then re-boxed and sold to Me!!
One Factory Return the other from original buyer. Both ran perfectly after assembly without any other purchases.

So what ideals do you have for a 3D Printer.

Cartesian
CoreXY
Delta
Polar
Ect.