Well I do not know what you buy, but I in my experience
sometimes the cheapest price is online. In particular when that purchase is stacked with one or more discount codes as well as cashback vehicles and/or FF Bonus Point Portals that are only available online.
Also there may be items on clearance not available at a store near oneself, if at all.
I have sometimes inspected an item, tried on shoes etc, instore and then bought the item online (with any promos codes) as it was cheaper than if I paid at the register.
Also sometimes, and indeed quite often, the cheapest price might from outside Australia.
- (downside is that delivery can be up to a month and so if I need it quicker I may pay more for that reason)
- (with some items where the warranty is important, or I may be concerned about repairs/ servicing etc, I will pay more to ensure I have good access to those things in Australia)