Any of the Ali ones have a steel frame?
@Ben_Martin you would not ask this question if you had read my post above.
@Hakan_Evirgen I meant others
If you are looking for a kit Prusa i3 Steel, here is one possible option, for less than USD$400, but without shipping costs:
http://www.repparts3d.com/gb/complete-kits/75-kit-leonardo-i3-steel.html
I could only find the cheap acrylic framed Prusa on AliExpress, at just over 1/2 the price of the Steel version above.
I am not specifically endorsing either http://repparts3d.com, or the Prusa i3 Steel, since I haven’t ordered from them, nor do I own that printer, I am merely pointing out things you might like to investigate for yourself. Caveat Emptor, as per usual.