Welcome to the forum Tucky, good to see another Ballarat local here.
The Gold Supply (shop) out Golden Point is worth a look for some 2nd hand detectors, James gets them in occasionally so worth checking, he may be able to help out. He also has some good picks for prospecting, (CC Picks), much better than the heavy bunnings stuff & better for prospecting.
Stay away from the real cheap detectors, for around 1k you should be able to get a decent 2nd hand Pulse Induction detector that will handle the mineralized ground, most VLF detectors will struggle in area's that have any more than mildly hot ground, although some are better than others.
Whites make a decent cheap P.I detector, the SPP, I've seen a couple 2nd hand for around 1k so thats another option.
VLF detectors are good for coins & relics & some like the Whites GMT can handle mildly hot ground & work well for small gold so thats another starting option.