You should research a reputable company who can handle the sale on your behalf without advance payments.
Times, Sunday Times (2012)
I have given my computer to a reputable company to be reconfigured.
Times, Sunday Times (2016)
If you fancy fitting a sunroof, then be sure to use a reputable company.
Times, Sunday Times (2012)
Any suggestion that we're not a reputable company is entirely unfair.
Times, Sunday Times (2014)