Samsung is running a TV + Soundbar promotion where you get additional discounts when both are in the cart.You can also claim a cashback via manual redemption when you purchase an eligible TV and Soundbar.
The best combination I've found in terms of value is:
To get both at JB Hi Fi at current sale prices is $3,494. This combo receives a $300 cashback.
But add them together to your cart on Samsung to get it for $3,448 before any further discounts (such as $50 off newsletter sign-up code), plus also the $300 cashback to bring it down to $3,118. Thanks for alpsz94 for confirming that pricing is $210 cheaper via the EPP, but does not include the $300 cashback.
I went to JB Hi-Fi with this and they eventually offered $3,298 for the TV + Soundbar combo including delivery, making it $2,998 after cashback. That beats the Samsung combined discounted price by a further $150. See receipt here. YMMV with negotiation.