create a facebook profile for your showroom.
invite your (dept store, specialty) buyers to join.
publish your line sheets and announcements on your wall.
unlike e-blasts where your email has to pass the junk filters, with a facebook profile the buyer has opted-in.
when publishing your line sheets make sure to set the permission to “friends only”.
for convenience set “friends only” as your default option.
facebook groups are another option: