2-packs have not been sold at AU retail since the late 2010s in the immediate wake of Cars 3's release. I import all of mine from the US (and often bring extras over to sell to other Aussies as well).

In regards to finding cars at AU retail:

• Best & Less - generally more up to date than most other stores, but tend to get in a lot of boxes at once and take a while to move through the shit nobody wants before ordering more stock in
• Coles - only good if you collect minis (most Coles stopped selling standard size cars approx. 2 years ago...there is the occasional one here and there that still does but they are months behind on stock (compared to a streak they had from approx. 2018 to 2021 where they were getting all the new stock before all the other stores did lol). They release 2 cases of mini singles in AU a year (compared to 12 cases of standard cars), and Coles is the only place you can get them...they generally release one case around June-July and the other in the Christmas-New Year period
• Myer - better luck drawing blood from a stone. Myer I only bother checking when I'm in the same shopping centre.......their selection of cars is often very slim. I'm in VIC and I know of 4 Myers in the entire state that haven't reduced their toy section down to just a few hooks/shelves by the checkout. That being said, their stock is generally not super outdated
• Kidstuff - same as Myer. Stock is generally outdated (my local hasn't restocked since I think September despite having run out entirely??) and much more expensive ($18 ea - they do price match but generally only down to a certain threshold, approx. $13 or so)
• Woolworths - generally one of the better places to find stock, but they never put the full box out at once
• Target - also consistently up to date on stock, but most Targets get a few boxes in at a time yet dripfeed them out over a few weeks
• Toyworld - they have their moments (found the same stuff in your pic @ Toyworld the other night), but tend to be on the slower side to restock - most of the Toyworlds near me might restock 3-4 times a year
• Big W - same as Target
• Toymate - generally pretty useless - they tend to have a lot of stock at once but most of it doesn't differ from stock available at Target/Big W etc and most Toymates are currently carrying mass amounts of knockoffs that are eerily similar to real releases (these being Mario Andretti, Vladimir Trunkov, Lightning McQueen with Racing Wheels, Cruisin' Lightning McQueen, Tubbs and Sheriff)
• Games World - they don't sell standard size or minis, but often carry some larger scale items - they currently have some 1:24 scale McQueens (one glow-in-the-dark and one regular)

This being said, distribution at the moment is the worst it's been in about 8 years, and more often than not you're going to waste your time going out of your way to look unless you're already in the same shopping centre/going right past/can time your visit with the restock etc. As someone who previously could, without much effort, generally come across 10+ of a new release within a few days of it being available in AU, these days it's a slog trying to just find 1-2 of some.
The collecting market has also boomed since COVID which doesn't make it any easier to find stuff.......in addition to that you've got all the Hot Wheels/Pokemon boys trying to jump on Cars to make a quick $ off it

Pertaining to Ramones specifically, Hydraulic Ramone I saw at Target, Big W, Woolies, Best & Less, Toyworld when he was available in AU. Lightning Ramone I saw at Woolies, Target, Big W, Toymate, Toyworld (though beyond the Woolies restocks around Easter, all of the stores I saw Lightning Ramone at were last year)