I have an original 1994 edition Sierra Papyrus NASCAR Racing Australian edition (don’t be jealous). You can check the links:
http://www.mobygames.com/game/nascar-racing
http://www.mobygames.com/game/nascar-racing/cover-art
http://www.mobygames.com/game/nascar-racing/cover-art/gameCoverId,66611/
http://www.mobygames.com/game/nascar-racing/cover-art/gameCoverId,66612/
http://www.mobygames.com/game/nascar-racing/cover-art/gameCoverId,66672/
I was thinking how much would I get if I sold it. It’s the DOS edition. And if you’re thinking I won’t sell it (no way). So how much do I get if I sell it to a collector? Actually, I still play it using DOSBOX and it’s pretty addictive.
Probably $10.
I don't know about the Australian version specifically, but a search of US sites came up with a ton of used copies, most of which were priced between $1 and $10 bucks.
Doesn't look like a collectors items yet. But hey, at $1 a pop, you could just buy everyone else's copies and then hold a monopoly on the old NASCAR sim market :)