I use peat free stuff and most places do not stock the one I prefer. I think I would be even more unpopular with my wife if I started putting soil in her microwave. And even sifted from this garden is likley to contain metal. You ain't seen our soil!
Used to sterilise the soil with the flame gun, but that stopped working a long time ago. Now been turned into a 'dragon' sculpture by my son in law.
If I get really desperate I will germinate the seeds in petrie dished in the 'fridge.