Onirii make some 200~210 ones, theyre good so far, only the grease inside them is quite thick so they don't spin back into neutral position very quick
Pretty sure those are SPD SL (road), not SPD (mountain).
We'll go M19 is a claimed 300g but I haven't seen anything on AliExpress substantially lighter than that. I think Xpedo have some lightweight options but they're pretty pricey.