The 30-year-old barely appeared in public during his stay in Australia from April 6 to May 9, but the public is still expected to foot the bill.

While Defence has not yet tallied the total cost of the stay, Fairfax Media has obtained documents containing the army's preliminary cost estimates.

The "proposal for expenditure" document lists the estimated total cost of the stay as $115,940.

That includes $10,000 for accommodation at the Robertson, Swanbourne and Holsworthy Barracks, $4000 for fuel for patrols in the Northern Territory and $1000 for water and Gatorade for "heat safety". There's $13,000 for travel and $1000 for rations.

There's also $500 for access to VIP rooms at Sydney and Perth airports.

But the biggest line item is $75,940 for "AME", which is believed to refer to Aero-Medical Evacuation aircraft that were on standby but never used.

The so-called "people's prince", who was known as Captain Harry Wales during his stay, is set to retire from the British Armed Forces in June after a decade of service, including two tours of Afghanistan.

During his stay he trained with Australia's elite special forces soldiers in Perth and went on NORFORCE patrols in the top end. He also visited the Australian War Memorial and met senior brass in Canberra.

If the Defence estimates prove accurate, taxpayers are getting off relatively easy this time. They were charged a whopping $150,000 for Prince Harry's two-night visit to Australia in 2013.

Last week it emerged that taxpayers had forked out $1.8 million to wine, dine and entertain foreign leaders such as British Prime Minister David Cameron and Japanese leader Shinzo Abe last year.