this seems to be a rather strange query.
I believe Luthemusic could be the only shop selling at a lower profit margin.
From what I know, Luther gets their synth from the authorised seller.
Music Plaza, Swee Lee, Citymusic and Sinamex are the distributor for
the major synths.
always consider used gear for cheaper keyboards.
go to jam studios normally they have old synths to get rid.
many jam studios have used 88key digital piano for sale.