Re: How well do you think this PC would run The Sims 3 packs CC?
@cementsocks I would guess that the answer is "not very well." I can't be completely sure because the product page doesn't list the exact processor, but machines in this category almost always come with processors that have integrated graphics chips that can't handle Sims 3. They generally run the base game okay, and maybe the first two or three expansions, but not more than that.
Are you set on a desktop, or would you be willing to consider a laptop? I searched Ebay Australia for laptops with an Intel i5-1135G7 processor, whichi is confirmed capable of handling high-ultra settings (I have two users whose reports I trust), and there are options below $400 AUD. I wouldn't consider a Dynabook, but a Dell/HP/Lenovo would likely still be in good condition if the original owner didn't damage it. This is a laptop processor, so you wouldn't find it in tower desktops, just the occasional all-in-one. But if a large screen is important to you, it would be easy enough to hook it up to a laptop.
Other suitable processors that might be in your price range would be the i7165G7, the Ryzen 5 5500U, and the Ryzen 7 4700U/4800U/5700U/5800U. The important detail is the CPU because that dictates what integrated graphics chip you get.