Corporate discount is $1600. My recommendation is get it from the merc dealership actually owned by Mercedes Australia as they will follow Merc guidelines. Some merc dealers owned by dealer principles are actually increasing dealer delivery costs, I have heard some cases of $2000 above RRP, because if high demand. Call around and find the merc owned dealership, call around for pricing and delivery dates regardless.
don't think you'll get down to 90k, cheapest i've heard was 94k on corporate, but i think most people got it for between 95-100k.
you'll also be looking at a 6 month wait depending on the dealer.
RACV has the CLA on thier online quote system now, mine came in at 2.2k/year, yet to get one from Merc (Allianz)
the corp programme also comes with 4 years roadside included.