New Zealand's new electronic travel authorities hasn't worked in its first two weeks - and the Immigration Minister has kept quiet about it.

ETAs became compulsory on October 1 for visitors from about 60 countries to help speed things up at the border.

Hundreds of passengers have been able to enter the country without ETAs, and they're not required to pay the $35 for a tourism and conservation levy.

Tourism Aotearoa CEO Chris Roberts told Heather du Plessis-Allan Iain Lees-Galloway should've been up front about the system issue earlier.

"The airlines aren't enforcing it, and the Minister passed a special declaration allowing the law to be suspended until the code is actually ready to go."

Meanwhile, Immigration New Zealand's warning about horrific mark-ups on websites selling the NZeta for 10 times the cost.

It says sites are popping up offering the new NZeTA, some using misleading names making heavy use of the words "official" and "gov".

Immigration says some sites claim to offer a quicker service - but they're simply submitting travellers' information to the official government website at a hefty premium.

And some sites are collecting additional information, not required for the eTA process.

An official NZeTA costs just $12 using the Immigration New Zealand website or $9 through the mobile app.