These Gorilla practice amps were apparently used by some big names back in the day, but I can't really verify those tales. It's a pretty nasty tone, and there's a bit of crunch in the pots etc, but it all works and is definitely good for a 90s era laugh.

NOTE: this amp has a USA power plug and runs on 110v input power, so you'll need a step down transformer to run it in Australia. 

Model: Gorilla GG25
Made: 1990s, recent model
Output: 25 watts
Power: 110V (USA/Canada)
Speaker: 8"
Channels: 1, 'tube stack' for extra crunch
Finish: black tolex
Mods: none
Weight: 5kg approx
Extras included: none

Condition notes: used, fully functional. There's plenty of marks and fading on the tolex. The pots are a bit crunchy and there's some hiss and noise, but it all works. Overall: good condition (7/10)