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PLEAT20
It'll be the cheapest it'll ever get (+/- a few $$).
Britax is never included in any big sales at the baby shops so the only way to get this sort of discounts is from eBay 20% sales.
Haven't been at this price since Nov 2019, and this doesn't require eBay plus.
Have had mine for 4 years now and definitely Britax quality > majority of the other brands I've used.
Alternative colour Pebble Grey - https://www.ebay.com.au/itm/Britax-Safe-N-Sound-Millenia-SIC…
Gray is back in stock, says 2