Purchase price, ongoing costs, and the expenses first-time owners forget entirely.
Goats look like the cheap way into livestock. The animals often are. The setup is where the money goes, and it is the part almost nobody budgets for.
Prices move with season, bloodline and how far you are willing to travel, so treat everything below as a general picture of the Australian market rather than a quote. Check current listings and ask breeders directly.
Across Australia, registered miniature and Nigerian Dwarf type goats broadly sit like this:
Unregistered animals of the same type sell for meaningfully less. That is fine if you want pets. It is a problem if you later decide you want to breed and sell.
Registered animals cost more and are worth it if you intend to breed. A registration gives you recorded parentage, a transferable record and a market for the progeny. Ask which registry the animal is recorded with, ask for the registration number rather than the word registered, and ask when the transfer will be lodged into your name.
DNA parent verification is becoming more common in Australian miniature goat registries, and it is a real protection for buyers — it means the pedigree on the page is the pedigree in the animal. Ask whether the animal or its sire is DNA typed. If the answer is vague, treat the pedigree as a claim rather than a fact.
Fencing is the big one and it is not optional. Small goats go under and through rather than over, so cattle or sheep fencing will not hold them. Budget for goat or dog mesh with small apertures, decent posts, and an offset hot wire. On a small paddock this can easily cost more than the goats standing in it, and it is the single most common thing new owners underestimate.
Then, in rough order of how soon you will need it:
None of it is dramatic. All of it is constant.
Transport, if the goats are not local. A Property Identification Code for your land, which is free or close to it through your state department of agriculture but must be sorted before the animals arrive. NLIS tags and the movement record. And time — goats need looking at daily, and someone reliable to look at them when you are away.
A second goat. Goats are herd animals and a single one is a loud, stressed, fence-testing problem. If you have been quoted for one, you have been quoted for half a setup. Budget for two at minimum, and three is better again, because losing one from a pair leaves you scrambling for a companion at the worst possible moment.
Add the animals, then the fencing, then the shelter and gear, then a year of feed and routine care. For most people the animals are the smallest line on that list. If the whole number still works, goats are an easy and genuinely rewarding thing to keep. If it only works when you ignore the fencing, the fencing will find you.