i never minded them , because their shape
but for them check here
also, there's a new version of...
the B2 are at preorder for $110
the R-50 at regular price are for $120
the dba mk2 and GR01 are about $170-180
as for other dual BA, you can check the westone W2 , tdk BA200 and sont XBA2
and i forgot the...