A lawyer says customers who thought they had purchased products from Harvey Norman at knockdown prices could go to the Disputes Tribunal.
A technical glitch on the retailer's website after midnight on Wednesday meant three-piece lounge suites worth thousands were advertised for just over a hundred dollars.
Rainey Collins Lawyers managing partner Alan Knowsley said if the customers did not agree to the terms and conditions they may have a case.
"They could go off to the Disputes Tribunal and seek to enforce their contract and then Harvey Norman will have to prove that the person should have known the deal was too good to be true," Mr Knowsley said.
"Some retailers obviously advertise regularly that things are 60-80 percent off and that sort of retailer would be really hard pushed to prove that that deal wasn't valid."
Harvey Norman said it was not providing any public comment on the matter.