Do what I did, which is pretty dodgy and you're gonna want to make sure the trailer is in good operable condition with good tyres if you're even considering doing this.
Hire a trailer, tell them you're not taking it out of the Metro area so its cheaper, take it interstate to get car, bring it back within said time frame, done.
Risky, very risky, and I wouldnt do it again, but its a dodgy option and if you're tight on cash....?