Credit to @littlesoldier who posted a link on The Good Guys post.
Ended up price matching with JB Hi-Fi and using $10 sign up my perks voucher, then paying the remaining $9 with the JB giftcards received from the SnackBack promo. (Claim multiple with all those Boost Sim deals)
[Blue/Red]
(https://www.officeworks.com.au/shop/officeworks/p/jbl-jr310-…)
[Blue/Pink]
(https://www.officeworks.com.au/shop/officeworks/p/jbl-jr310-…)
Waiting for JB price match lines to open to match it again, hope it doesn't get OOS until then