If you plan and source your parts in advance, you can do OK even with OEM parts. The last few OEM Mitsubishi parts I have purchased have been on eBay from a seller in the United Arab Emirates!?! Sounds crazy but even with shipping, their parts prices are usually better than anything in North America. This probably won't work for a fender, but they shipped me some OEM wheel bearings that got here just fine.
Some things have improved over the years. OEM loaded brake drums from Mitsubishi used to be the only option. Now I'm seeing more cheap aftermarket drums showing up even at normal auto parts stores like AutoZone and O'Reilly.
My only observation is that nobody ever has Mirage stuff in stock locally. Need a drum brake hardware kit for a Mirage? No problem...it's only $12. But they have to get it from the warehouse in Buttcrack North Dakota so it won't be in the store for 5 days. So this isn't the best car to own if you're used to rolling into Autozone with a laundry list of parts and expect them to have everything in stock right now.
__________________________________________
View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)