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From Sydney the cheapest flight to Vic Falls is currently about $2002 US and $1610 US to Jo'burg.
Currently the most cost effective option into Vic Falls ($2002 + $45*2+$20 + $160 US) assuming OZ or UK passport is:

  Sydney (SYD) to Victoria Falls (VFA)
Flight info Dates Misc Fares  
Singapore 222
Boeing 747-400		 Aug 17   3:50 pm depart SYD
Aug 17   9:50 pm arrive SIN		 stops:Non-stop Class: Coach
 
Singapore 406
Boeing 747-400		 Aug 18   1:20 am depart SIN
Aug 18   5:45 am arrive JNB		 stops:Non-stop Class: Coach
Air Zimbabwe 308
Boeing 737 (200/200C)		 Aug 18   9:20 am depart JNB
Aug 18 11:15 am arrive VFA		 stops:Non-stop Class: Coach
Victoria Falls (VFA) to Sydney (SYD)
Flight info Dates Misc Fares  
British Airways 6282
(Operated by Commercial Airways Ltd)
Boeing 737		 Aug 25   2:45 pm depart VFA
Aug 25   4:25 pm arrive JNB		 stops:Non-stop Class: Coach
 
South African 280
Boeing 747		 Aug 25   8:50 pm depart JNB
Aug 26   7:00 pm arrive SYD		 stops:1 Class: Coach

Compared to into J'oburg and the Charter to Kasane ($1610 + $475 US; no Zim costs)

Sydney (SYD) to Johannesburg (JNB)
Flight info Dates Misc Fares  
Singapore 222
Boeing 747-400		 Aug 17   3:50 pm depart SYD
Aug 17   9:50 pm arrive SIN		 stops:Non-stop Class: Coach
 
Singapore 406
Boeing 747-400		 Aug 18   1:20 am depart SIN
Aug 18   5:45 am arrive JNB		 stops:Non-stop Class: Coach
Johannesburg (JNB) to Sydney (SYD)
Flight info Dates Misc Fares  
South African 280
Boeing 747		 Aug 25   8:50 pm depart JNB
Aug 26   7:00 pm arrive SYD		 stops:1 Class: Coach