Have a look at Steam. The full pro version is quite pricey, but the Movie Studio version is quite a bit cheaper and still has a decent range of features. They tend to have the previous two versions on special, when I checked a few days ago they had then on special for a bees dick over $AU20.
I don’t think the pro version offers enough to justify the price considering the Movie Studio version is already quite powerful.
Edit: the system requirements are fairly modest as well. Unless you’re doing 4K, they basically recommend a 2Ghz dual core with 16gb RAM. That’s a fairly low bar, so pretty much anything in the last few years should run OK bit obviously you’ll want something a bit more powerful for larger projects or if you like your effects.
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