eBay sellers are often silly (I miss when it was an actual auction site instead of a shitty amalgamation of Amazon's 3rd party sellers and craigslist) although

eBay sellers are often silly (I miss when it was an actual auction site instead of a shitty amalgamation of Amazon's 3rd party sellers and craigslist) although a lot of these vintage UNIX machines are now worth at least $100USD or more. Your best bet would be to find a private computer collector in AU or a mailing list like cctalk and express your interest.