Suncorp Bank has joined Westpac and NAB to offer online customers security software but the deal isn't nearly as sweet as what it appears.
AVG said the saving of the trial and discount was around 40 percent off the price of the software.
But the security vendor already has a free, 30-day trial and offers from Big-Four banks are more competitive.
NAB offers its customers a year's subscription to ZoneAlarm's Internet Security Suite for $34.98.
Customers can buy a two-year licence for $46.75.
NAB also offers PC Tools' anti-spyware software for $33.95 a year.
AVG's A/NZ marketing manager Lloyd Borrett praised Suncorp's thinking.
"Most people rank online banking as one of the top online activities that makes their lives easier," he said.
"While all banks are actively encouraging their customers to conduct their transactions online, we appreciate the responsible position Suncorp has taken to ensure its customers have greater peace of mind with all their online transactions".