I checked XE.com
and see that $20,000 aus = $14,820 us
Most of us on this site paid less than $4,000 us for our busses (I think) so to us that may seem like a lot (it does to me)
I also did a serch and found a picture of a bus
that looks more like a transit bus, which is a diffrent style from a school bus & generaly costs more. I dont know if this was a PMC Elwood - I didnt find much info on that kind of bus & I've never heard of a PMC Elwood so I dont know much about them sorry.